Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums http://www.yfzcentral.com/forum/ The ATV Channel - Your #1 source for ATV news, reviews, race coverage, contests, pictures, videos, wrecks and more! en Sun, 26 May 2013 09:22:03 GMT vBulletin 60 http://www.yfzcentral.com/forum/images/YFZCentral/misc/rss.jpg Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums http://www.yfzcentral.com/forum/ Pismo Beach 6/14-16/13 fathers day http://www.yfzcentral.com/forum/22-west/144953-pismo-beach-6-14-16-13-fathers-day.html Sun, 26 May 2013 06:15:31 GMT anyone gonna be out there anyone gonna be out there ]]> West silver06wrx http://www.yfzcentral.com/forum/22-west/144953-pismo-beach-6-14-16-13-fathers-day.html Annihilated trx450 http://www.yfzcentral.com/forum/32-yfz-powertrain/144945-annihilated-trx450.html Sun, 26 May 2013 05:54:53 GMT Had a few races with a couple of trx 450's yesterday.

One has the hrc kit without cams that's been jetted and dyno'd with a few map settings. The other has full hrc kit and a few extras (dyno'd with different maps). One is running brand new stockers and the other is running kt335's

I have dasa and fci.. No box.. 50% left on stock tyres with my own untested custom pattern. I butt dyno'd and jetted. I ended up going smaller jets.. 168/4/48. Smoked both of them by bike lengths.

They asked what I had done to my bike... I said I jetted it.. They excused of engine work. I said.. Well I did cut my fenders... Better aerodynamics.

Yfz450's are damn fast with just pipe and fci ]]> YFZ Powertrain austatv http://www.yfzcentral.com/forum/32-yfz-powertrain/144945-annihilated-trx450.html Pop but no start http://www.yfzcentral.com/forum/32-yfz-powertrain/144937-pop-but-no-start.html Sun, 26 May 2013 04:21:55 GMT Guessing its a carb issue but looking for input jets are 170 and 45 with terry design concept.exhaust full exhaust esr intake and k&n filter gas in the tank is regular pump gas i know the battery is shot but we jumped it and cranked over great and would pop. I pulled the bowl apart cleaned both jets and set air/fuel screw at 1 3/4 give me the .02 please!!! ]]> YFZ Powertrain Tpowers11 http://www.yfzcentral.com/forum/32-yfz-powertrain/144937-pop-but-no-start.html powder coating a bunch of parts http://www.yfzcentral.com/forum/13-images-other-media/144921-powder-coating-bunch-parts.html Sat, 25 May 2013 23:13:32 GMT iv started powder coating a bunch of parts on my 2008 yfz450se so far the front bumper,levers,clutch cover,and im doing the rims and hubs now will... iv started powder coating a bunch of parts on my 2008 yfz450se so far the front bumper,levers,clutch cover,and im doing the rims and hubs now will post pics of rims and hubs when done





]]> teardrop http://www.yfzcentral.com/forum/13-images-other-media/144921-powder-coating-bunch-parts.html Is It TPS Problems? http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144897-tps-problems.html Sat, 25 May 2013 18:43:03 GMT Hey everyone,

Im hoping that this will be the final fix for my "stalling out" problem. Just looking for some insight here.. maybe someone else had the same problem?

Seems like every time i reach the top of a hill climb and grab the clutch in and let go of the throttle the quad immediately stalls out.. i notice it stalling in most instances when I'm lettin off the throttle real fast.. I'm as dialed in with my jetting as i can get without having a Air/fuel meter on it and I'm just wondering if maybe its my TPS giving me problems.. Either way im at my wits end with this issue :angryfire: .

Thanks in advance for any and all advice. Happy memorial day to everyone too! ]]> trd1717 http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144897-tps-problems.html Is it my tps giving me probs??? http://www.yfzcentral.com/forum/35-maintenance/144881-my-tps-giving-me-probs.html Sat, 25 May 2013 17:39:45 GMT Hey everyone,

Im hoping that this will be the final fix for my "cutting out" problem. Just looking for some insight here.. maybe someone else had the same problem?

Seems like every time i reach the top of a hill climb and grab the clutch in and let go of the throttle the quad immediately stalls out.. i notice it stalling in most instances when I'm lettin off the throttle real fast.. I'm as dialed in with my jetting as i can get without having a Air/fuel meter on it and I'm just wondering if maybe its my TPS giving me problems.. Either way im at my wits end with this issue :angry .

Thanks in advance for any and all advice. Happy memorial day to everyone too! ]]> Maintenance trd1717 http://www.yfzcentral.com/forum/35-maintenance/144881-my-tps-giving-me-probs.html Genoa Jamboree http://www.yfzcentral.com/forum/25-mid-west/144841-genoa-jamboree.html Sat, 25 May 2013 04:07:23 GMT Ok so who is all going? Its coming up real soon, wondering how many people on here are gonna come down and ride!? Its gonna be a blast, drag races,... Ok so who is all going? Its coming up real soon, wondering how many people on here are gonna come down and ride!? Its gonna be a blast, drag races, trail rides, mud bogs...manyyy more!! Tons of people to ride with!! :) June 7th, 8th, and 9th in Genoa Nebraska! :locked ]]> Mid-West tech#9 http://www.yfzcentral.com/forum/25-mid-west/144841-genoa-jamboree.html 05 yfz450 troubles?!?! http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144833-05-yfz450-troubles.html Sat, 25 May 2013 02:57:45 GMT i had just recently purchased a 05 yfz450 the bike ran perfect for me started perfect no problems. Then a few days later my electric isnt working,... i had just recently purchased a 05 yfz450 the bike ran perfect for me started perfect no problems. Then a few days later my electric isnt working, its wanting to crank over but not enough to turn on, but i am able to push start it no problems. Today i did an oil change, changed the spark plug, and put a new battery in and rode for 15 minutes tonight and after 15 minutes the lights shut off and the bike died completely. I then tried jump starting it and it would turn put as i gave it gas it would bog out, then when i pulled the clutch it the bike completely shut off. any ideas on what could be wrong any bit of help would be greatly appreciated. ]]> 05yfz450cc http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144833-05-yfz450-troubles.html Case saver and chain guide http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144817-case-saver-chain-guide.html Sat, 25 May 2013 00:25:14 GMT Hey every one looking for a new case saver and chain guide I like the tm design ones but I can't seem to find one for a yfz450r can you guys help me out with a link or part numbers for both of those things thanks. ]]> jmetler http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144817-case-saver-chain-guide.html Electrical question. http://www.yfzcentral.com/forum/32-yfz-powertrain/144809-electrical-question.html Fri, 24 May 2013 21:43:40 GMT Hi everyone.

I'm terrible when it comes to electrical side of the quad, so here is my question.
Was just loading it in the back of the truck. Had to jump start it to get it to run after the winter (it was cranking but wasn't enough to get it to start). I ran it for a while and now when I kill it it won't start and the light won't even come on. I hooked the jumper pack back up, and it lights up and starts right away.

I haven't had the time to check everything yet, work 2nd shift, leave for the dunes right after work. But what could it possibly be? I am guessing a battery disconnect somewhere or a fuse, but I checked the 2 right above the battery and they are fine. I did test the battery as well and there is charge. It just acts like it's not there, when I turn the key.


Just looking for ideas of what to check. Thank you in advance! ]]> YFZ Powertrain Leo 450yfz http://www.yfzcentral.com/forum/32-yfz-powertrain/144809-electrical-question.html Whats the best long travel front end to use http://www.yfzcentral.com/forum/33-suspension-steering/144793-whats-best-long-travel-front-end-use.html Fri, 24 May 2013 20:54:52 GMT I have a 2005 yfz 450 and wanted to get some imput on waht the best long travel front end would be I have a 2005 yfz 450 and wanted to get some imput on waht the best long travel front end would be ]]> Suspension and Steering LOGANKALEB http://www.yfzcentral.com/forum/33-suspension-steering/144793-whats-best-long-travel-front-end-use.html Precision Shock and Vibe Clamps.... http://www.yfzcentral.com/forum/33-suspension-steering/144777-precision-shock-vibe-clamps.html Fri, 24 May 2013 20:41:54 GMT Does anyone know if there is a pdf manual for these or has a copy? Just want to know the torque settings and also if there is any maintainence... Does anyone know if there is a pdf manual for these or has a copy?

Just want to know the torque settings and also if there is any maintainence that needs doing? ]]> Suspension and Steering Pilchy http://www.yfzcentral.com/forum/33-suspension-steering/144777-precision-shock-vibe-clamps.html Whats the best air filter to use http://www.yfzcentral.com/forum/35-maintenance/144769-whats-best-air-filter-use.html Fri, 24 May 2013 20:24:03 GMT I just bought a 2005 yfz450 and a freind gave me a mod quad kit with the k+n filter but i have heard that the k+n are bad for 4 wheelers. True or not... I just bought a 2005 yfz450 and a freind gave me a mod quad kit with the k+n filter but i have heard that the k+n are bad for 4 wheelers. True or not and if so what's the best ]]> Maintenance LOGANKALEB http://www.yfzcentral.com/forum/35-maintenance/144769-whats-best-air-filter-use.html Wheel spacers vs extended axle http://www.yfzcentral.com/forum/125-new-member-intros/144761-wheel-spacers-vs-extended-axle.html Fri, 24 May 2013 20:21:41 GMT Building a 2005 yfz450 and trying to keep the budget down and was wondering if wheel spacers where as effective as a new extended axle.. Building a 2005 yfz450 and trying to keep the budget down and was wondering if wheel spacers where as effective as a new extended axle.. ]]> LOGANKALEB http://www.yfzcentral.com/forum/125-new-member-intros/144761-wheel-spacers-vs-extended-axle.html <![CDATA[Where's the best place is to ride in maine]]> http://www.yfzcentral.com/forum/24-north-east/144753-wheres-best-place-ride-maine.html Fri, 24 May 2013 20:19:03 GMT Just bought a 2005 yfz450 and i havent rode in over 15 yrs and was wondering where the best place was to ride in maine Just bought a 2005 yfz450 and i havent rode in over 15 yrs and was wondering where the best place was to ride in maine ]]> North-East LOGANKALEB http://www.yfzcentral.com/forum/24-north-east/144753-wheres-best-place-ride-maine.html Simple question http://www.yfzcentral.com/forum/33-suspension-steering/144737-simple-question.html Fri, 24 May 2013 20:01:56 GMT Very new to wrenching on my quad, I need new shocks on the front of my yfz. My question is what size does it take? What exactly does size refer to,... Very new to wrenching on my quad, I need new shocks on the front of my yfz. My question is what size does it take? What exactly does size refer to, length? Diameter of the mounting holes on the ends? Really don't know what to look for and would appreciate some knowledge.

Thanks in advance ]]> Suspension and Steering zackattack http://www.yfzcentral.com/forum/33-suspension-steering/144737-simple-question.html larger gas tank http://www.yfzcentral.com/forum/36-parts-reviews/144729-larger-gas-tank.html Fri, 24 May 2013 19:27:35 GMT Does anyone make a larger "desert" tank for the EFI 450R? ]]> Parts Reviews crazychemist http://www.yfzcentral.com/forum/36-parts-reviews/144729-larger-gas-tank.html 2013 EFI 450R exh, intake, programmer. http://www.yfzcentral.com/forum/36-parts-reviews/144721-2013-efi-450r-exh-intake-programmer.html Fri, 24 May 2013 19:19:49 GMT Looking to do the exhaust in a month or two and wanted to know now what I need in the way of an exhaust, programmer and intake. What do you run... Looking to do the exhaust in a month or two and wanted to know now what I need in the way of an exhaust, programmer and intake.

What do you run and what do you think of it?

I ride desert, dunes, and trails, but no real track racing. it needs to have a spark arrester and a nice throaty sound but not needing it to be real loud. ]]> Parts Reviews crazychemist http://www.yfzcentral.com/forum/36-parts-reviews/144721-2013-efi-450r-exh-intake-programmer.html how many of you have back problems and still ride? http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144705-how-many-you-have-back-problems-still-ride.html Fri, 24 May 2013 18:00:33 GMT Someone rear ended my truck 3 years ago and my back has been shot ever since....my T11,T12 vertebrae are herniated and one of them is bulging out as... Someone rear ended my truck 3 years ago and my back has been shot ever since....my T11,T12 vertebrae are herniated and one of them is bulging out as well
...im only 24 man and this shit sucks...i just want to ride withtiut my back hurting.

anyone else go through this bullshit? ]]> YFZCentral lounge! JDiablo http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144705-how-many-you-have-back-problems-still-ride.html Need help please, starting problems!! http://www.yfzcentral.com/forum/35-maintenance/144697-need-help-please-starting-problems.html Fri, 24 May 2013 15:48:58 GMT Hi guys, first of all thanks in advance... Im having a problem with my 2005 YFZ 450, when I first start it in the morning it takes long to start,... Hi guys,

first of all thanks in advance... Im having a problem with my 2005 YFZ 450, when I first start it in the morning it takes long to start, also I have to hit the accelerator quickly to make it start a little faster. When it starts I turn it off and it will start normaly, but if I leave it off for a long time It take a long time again to start... Any idea what it could be and how to fix??

Thanks in advance and really appreciated help. ]]> Maintenance junprtc http://www.yfzcentral.com/forum/35-maintenance/144697-need-help-please-starting-problems.html question http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144673-question.html Fri, 24 May 2013 12:28:53 GMT will a 2013 yfz 450 carb fit on my 06 will a 2013 yfz 450 carb fit on my 06 ]]> Aaron109 http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144673-question.html 07 YFZ With YFZR Rear Fender and Seat Sneak Peek http://www.yfzcentral.com/forum/13-images-other-media/144665-07-yfz-yfzr-rear-fender-seat-sneak-peek.html Fri, 24 May 2013 05:38:45 GMT Hey guys, wanted to share my project. I lowered my subframe and installed the YFZR fender and seat. The job came out pretty clean. I will post better... Hey guys, wanted to share my project. I lowered my subframe and installed the YFZR fender and seat. The job came out pretty clean. I will post better pics when I get it outside and clean it. This setup is much better in the corners. The R fender flares are back further which provides for more room when leaning in the corners. The seat is much better too.



]]> adrenaline junky http://www.yfzcentral.com/forum/13-images-other-media/144665-07-yfz-yfzr-rear-fender-seat-sneak-peek.html New from Cali. http://www.yfzcentral.com/forum/125-new-member-intros/144657-new-cali.html Fri, 24 May 2013 04:07:34 GMT New member from Cali. whats up all... New member from Cali. whats up all... ]]> Radar1 http://www.yfzcentral.com/forum/125-new-member-intros/144657-new-cali.html How do you know if you have a bad starter? http://www.yfzcentral.com/forum/35-maintenance/144641-how-do-you-know-if-you-have-bad-starter.html Fri, 24 May 2013 02:22:31 GMT Ive tried searching through the threads and couldnt find a direct answer so my question is, how exactly do you know you have a bad starter? currently... Ive tried searching through the threads and couldnt find a direct answer so my question is, how exactly do you know you have a bad starter? currently on my 05' the battery is charged to 12.5v (checked with a multimeter) and when i go to turn it over it turns pretty slowly like the battery is almost drained and drops down to about 6.5-7.5v when turning over. After a few turns it doesnt start but the battery still read 12-12.5v sittin there. So basically what are some signs of a bad starter and do you think mine is bad? ]]> Maintenance Alpine9887 http://www.yfzcentral.com/forum/35-maintenance/144641-how-do-you-know-if-you-have-bad-starter.html Yfz needs help asap! http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144609-yfz-needs-help-asap.html Fri, 24 May 2013 01:58:04 GMT hey guys i am new to the site to start off... i chose this forum because i see alot of good help... anyways lets see who can help me with my issue? ... hey guys i am new to the site to start off... i chose this forum because i see alot of good help... anyways lets see who can help me with my issue?

Got a 2004 yfz 450. Took it out riding for aprx 45 min. middle of riding died on its own? Had a new battery in it . Pop started it once fine. Now it will not pop start at all ! Has a new gel battery when i try to start it sounds like a weak battery will not turn motor over maybe once . also replaced starter. jumped it once w cables and it fired and started to act up again? need some serious help. cleaned all terminals all are good and connected and secure. starting relay is not to old .

help a nooob out ! :( ]]> YFZCentral lounge! StlYFZrider http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144609-yfz-needs-help-asap.html 05 yfz parts compatibility? http://www.yfzcentral.com/forum/35-maintenance/144577-05-yfz-parts-compatibility.html Thu, 23 May 2013 22:52:59 GMT I crashed my 450 pretty bad last year and I am looking to get her ripping around again. I hope I am in the right forum if I'm not please direct me. The parts I need are the steering column/shaft, upper and lower A-arms for the right front corner, new shocks on both sides on the front, and a new right front wheel.

My question is, which other model years of yfz have these identical parts? I am wanting to buy as much stuff used as I can. Also what shocks/coilovers would you guys recommend? Also a clutch lever but I think I would be best of buying that new. If anyone has any of these parts for sale I would be happy to hear about it.

Thanks guys! ]]> Maintenance zackattack http://www.yfzcentral.com/forum/35-maintenance/144577-05-yfz-parts-compatibility.html from canada http://www.yfzcentral.com/forum/125-new-member-intros/144569-canada.html Thu, 23 May 2013 22:45:07 GMT Hey there, I'm looking for some answers and/or parts for my 05 yfz which led me to finding this site. Seems to be the place to be for yfz discussion. I am from Alberta Canada. ]]> zackattack http://www.yfzcentral.com/forum/125-new-member-intros/144569-canada.html how to seal up expansion pipe to flange? http://www.yfzcentral.com/forum/14-other-yamaha-quads/144561-how-seal-up-expansion-pipe-flange.html Thu, 23 May 2013 22:41:24 GMT got a blaster with a right side trenga exhaust and having issues with sealing pipe to flange, it only has one spring and is not a tight fit. engine... got a blaster with a right side trenga exhaust and having issues with sealing pipe to flange, it only has one spring and is not a tight fit. engine builder put orange permatex on it but did not hold, i just put motoseal 1 on it to try. can i just weld it up or jb weld it if the motoseal fails? ]]> Other Yamaha quads! 08yfzman http://www.yfzcentral.com/forum/14-other-yamaha-quads/144561-how-seal-up-expansion-pipe-flange.html Cant access marketplace http://www.yfzcentral.com/forum/93-yfzcentral-help-desk/144553-cant-access-marketplace.html Thu, 23 May 2013 22:26:53 GMT Why cant i access the marketplace Why cant i access the marketplace ]]> Yfzcentral Help Desk cnote1115 http://www.yfzcentral.com/forum/93-yfzcentral-help-desk/144553-cant-access-marketplace.html 10% off Houser thru Memorial Day http://www.yfzcentral.com/forum/113-immortal-atv/144537-10-off-houser-thru-memorial-day.html Thu, 23 May 2013 21:51:21 GMT 10% off most Houser Racing products thru Memorial Day. Sale applies automatically in shopping cart: Houser Racing Products-Immortal ATV... 10% off most Houser Racing products thru Memorial Day. Sale applies automatically in shopping cart:

Houser Racing Products-Immortal ATV ]]> Immortal ATV Immortal ATV http://www.yfzcentral.com/forum/113-immortal-atv/144537-10-off-houser-thru-memorial-day.html front wheel studs http://www.yfzcentral.com/forum/33-suspension-steering/144529-front-wheel-studs.html Thu, 23 May 2013 20:44:08 GMT I have a 05 yfz 450 and i bought some hiper tech 3 beadlocks for it the back wheels fit fine but the front ones fit but the stock studs are to short... I have a 05 yfz 450 and i bought some hiper tech 3 beadlocks for it the back wheels fit fine but the front ones fit but the stock studs are to short to put the lug nuts back on........does anyone know where i can get some longer studs ]]> Suspension and Steering Joseph232495 http://www.yfzcentral.com/forum/33-suspension-steering/144529-front-wheel-studs.html Milling head http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144521-milling-head.html Thu, 23 May 2013 20:28:05 GMT This last trip to little Sahara ok I blew my head gasket. I read to go ahead and get the head milled just to make sure the surfaces are flat. So went... This last trip to little Sahara ok I blew my head gasket. I read to go ahead and get the head milled just to make sure the surfaces are flat. So went to the local machine shop and asked how much he would charge. He said it would be $50 just for the head or just the cylinder. Does this price seem fair? Is there any alternative to ensuring the surfaces are flat? Should I do the cylinder as well? Any input will be greatly appreciated. ]]> dbbyfz450 http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144521-milling-head.html ksr exhaust concepts? http://www.yfzcentral.com/forum/36-parts-reviews/144505-ksr-exhaust-concepts.html Thu, 23 May 2013 18:14:34 GMT Has anyone tried out a ksr exhaust on a yfz, I'm curious about how well they work iv seen Honda guys like them but I haven't seen any Yamaha guys with one ]]> Parts Reviews mcclain44 http://www.yfzcentral.com/forum/36-parts-reviews/144505-ksr-exhaust-concepts.html 07 yfz 450 motor rebuild questions http://www.yfzcentral.com/forum/35-maintenance/144473-07-yfz-450-motor-rebuild-questions.html Thu, 23 May 2013 16:27:24 GMT I have a 07 yfz 450 and I took to a shop to get it looked at, they said that my crank rod bearings seized up and that I needed a new cylinder,... I have a 07 yfz 450 and I took to a shop to get it looked at, they said that my crank rod bearings seized up and that I needed a new cylinder, piston, crank assembly. And put a price tag of 1548 to do the total motor rebuild. I am going to do the repair myself. My question is, what should I put in it and where do I buy the parts at. I am leaning toward a wr crank, cp piston and stock 95mm cylinder. I want it to run on pump gas so no higher then 12.5:1 piston. If i could be linked to all of my parts I need that would be great.


Where do I buy all of these parts at?

Links would be helpful, thank you!




I am new to the forum, hope I did everything alright. ]]> Maintenance malott21 http://www.yfzcentral.com/forum/35-maintenance/144473-07-yfz-450-motor-rebuild-questions.html bad crash, thank you chest protector http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144465-bad-crash-thank-you-chest-protector.html Thu, 23 May 2013 15:36:48 GMT well I had a bad crash over the weeknd as me and a couple buddies went to ROMP MX In richwood Mo and I hit a jump it kicked me sideways and thats... well I had a bad crash over the weeknd as me and a couple buddies went to
ROMP MX In richwood Mo and I hit a jump it kicked me sideways and thats all she wrote for me
I landed sorta sideways it throw me off the bike and I know the bike hit me but to go back and watch the go pro video the bike had actually landed on me and
please please everyone wear a chest protector cause thats what saved me I believe
I have some bad road rash and my ribs are bruised and my knee is messed up but without the chest protector who knows what else could of happened

that is me under the bike :/

I

bent my a arms



tweaked my frame aswell look at the top its tweakd to the left . im heart broken just paid the thing off
]]> YFZCentral lounge! c_meczkowski@yahoo.com http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144465-bad-crash-thank-you-chest-protector.html Bars, hood and graphics http://www.yfzcentral.com/forum/13-images-other-media/144449-bars-hood-graphics.html Thu, 23 May 2013 14:48:08 GMT A few new parts. white CF hood from Maier, Renthal Bars and number plates from GYTR. Simple & Clean. Metal Mulishia stickers only there so my boots aren't ripping into the plastics and only til I get the clear vinyl to replace them.



]]> redline5th http://www.yfzcentral.com/forum/13-images-other-media/144449-bars-hood-graphics.html riding in the rain http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144441-riding-rain.html Thu, 23 May 2013 13:50:28 GMT Got a bunch of buddies going out for a big ride tonight and it is supposed to be bad weather with thunderstorms and even a possibility of hail. I've only had the quad for a couple of weeks and can't decide if I want to risk going out in some heavy rain. ]]> duramax20 http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144441-riding-rain.html top end rebuild now no spark http://www.yfzcentral.com/forum/35-maintenance/144433-top-end-rebuild-now-no-spark.html Thu, 23 May 2013 13:43:09 GMT OK so I finally got all my parts and put my 05 back together. The project went smooth everything went back together as it should. Did the cam mod... OK so I finally got all my parts and put my 05 back together. The project went smooth everything went back together as it should. Did the cam mod changed the oil new plug and now I have no spark. The plug is cover in gas but no spark. Any help would be great big ride this weekend!!! ]]> Maintenance yfzmedic1217 http://www.yfzcentral.com/forum/35-maintenance/144433-top-end-rebuild-now-no-spark.html wtf?? weird http://www.yfzcentral.com/forum/32-yfz-powertrain/144425-wtf-weird.html Thu, 23 May 2013 13:28:32 GMT So my yfz usually runs like a million bucks as I bad it professionally dynotuned by a local power sports dealer. Yesterday it was hot and... So my yfz usually runs like a million bucks as I bad it professionally dynotuned by a local power sports dealer. Yesterday it was hot and muggy..hotter and more humid than what is average and what I usually ride in. It was around 85 degrees and near 100% humidity. Now..I went riding w my 2 buddies and every time I opened her up WOT she was spitting and bucking. I thought maybe the carb was dirty or something. So I was tinkering Around and while riding I took off my airbox lid. I took it off and she ran like a million bucks and pulled harder than ever. I never knew that hotter and more humid conditions can do that to a bike and require more air. Is that normal? ]]> YFZ Powertrain cbohenek http://www.yfzcentral.com/forum/32-yfz-powertrain/144425-wtf-weird.html 06 yfz problem not a clue on what else it could be http://www.yfzcentral.com/forum/35-maintenance/144393-06-yfz-problem-not-clue-what-else-could.html Thu, 23 May 2013 12:25:06 GMT i got it rebuilt from one crank bearing seizing, and it had no spark while trying to start it so i bought a new cdi and it fixed the spark problem... i got it rebuilt from one crank bearing seizing, and it had no spark while trying to start it so i bought a new cdi and it fixed the spark problem but it will not start. i cleaned the carb and its getting gas and it just backfires out of the carb the mechainic said. anyone know what the problem is? ]]> Maintenance Aaron109 http://www.yfzcentral.com/forum/35-maintenance/144393-06-yfz-problem-not-clue-what-else-could.html exteded swingarm http://www.yfzcentral.com/forum/33-suspension-steering/144385-exteded-swingarm.html Thu, 23 May 2013 05:26:44 GMT Can anyone let me know where I can get an extended swing arm for my yfz? I'm looking at a +6 or +8. maybe if there are any kits that comes with the brake lines and such. ]]> Suspension and Steering Spazz http://www.yfzcentral.com/forum/33-suspension-steering/144385-exteded-swingarm.html boiling rear brake fluid http://www.yfzcentral.com/forum/33-suspension-steering/144377-boiling-rear-brake-fluid.html Thu, 23 May 2013 04:51:23 GMT so...i just refreshed the rear brake with new Dot 4 fluid and new pads. My boy is still having trouble with sometimes boiling the rear. the rear... so...i just refreshed the rear brake with new Dot 4 fluid and new pads. My boy is still having trouble with sometimes boiling the rear.

the rear rotor is the stock Yammy solid rotor.

question...how much help, as far as cooling, will a drilled rotor or wave rotor make.

I think he just rides the brake too much, but not sure. I have boiled it once riding his quad and I've never boiled my quad (Honda).

anyway...what'd ya think?

oh yea...2005 YFZ 450 ]]> Suspension and Steering tgracing http://www.yfzcentral.com/forum/33-suspension-steering/144377-boiling-rear-brake-fluid.html Knees bruising from quad sides... http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144369-knees-bruising-quad-sides.html Thu, 23 May 2013 03:19:45 GMT What do you guys use to stop the bruising from your knees riding the plastics around turns while mx or xc riding? I'm not sure if i want to put something on my quad, wearing knee pads, or getting one of those soft braces. ]]> ellenberger http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144369-knees-bruising-quad-sides.html 07 yfz 450 wont start!!! http://www.yfzcentral.com/forum/35-maintenance/144361-07-yfz-450-wont-start.html Thu, 23 May 2013 02:53:47 GMT So i just put my engine back together, new stock stroke hot rods crank and a JE 12.5-1 piston, stock cams. Im pretty positive i have the cams set... So i just put my engine back together, new stock stroke hot rods crank and a JE 12.5-1 piston, stock cams. Im pretty positive i have the cams set correctly and im getting fuel and a steady spark but it will not pop off. Ive pulled the plug and im getting plenty of pressure coming out of the spark plug hole(dont have the right adapters for my compression tester). I set my top ring at .016" and my second at .019" so i dont see myself being at a loss of compression. Any advise would be greatly appreciated, these are a completely different world from building race car engines:/ ]]> Maintenance blackmopar21 http://www.yfzcentral.com/forum/35-maintenance/144361-07-yfz-450-wont-start.html my yfz build http://www.yfzcentral.com/forum/119-quad-projects/144353-my-yfz-build.html Thu, 23 May 2013 02:47:36 GMT So I've been thinking about building my yfz to a bigger bore. I've seen kits on ebay going anywhere from $1,000to $1,800. Now my question is do you guys think those kits would be all I need to build my yfz? I need feedback, plz help me out guys. ]]> Quad Projects Spazz http://www.yfzcentral.com/forum/119-quad-projects/144353-my-yfz-build.html A few questions http://www.yfzcentral.com/forum/35-maintenance/144345-few-questions.html Thu, 23 May 2013 01:57:09 GMT Ok, trail of tears starts here. I bought my '04 450 all it needed was a head gasket-replaced that he told me it would run fine then when it got hot it just dies. Then I started having idle issues, bog issues 1/20-WOT, headlight issues and found the cooling fan does not kick on so the guy before me hard wired it straight to the battery.

I have changed the jetting to a 45 pilot and 168 main, I have a K&N filter no lid and GYTR pipe elevation is 1,243 ft.The carb has been cleaned 100x every port and hole. I did the zip tie mod. The bog and idle issue seemed to get better with the new jetting the bog went from 1/2 throttle to just 3/4 to wide open. I have the air screw turned all the way in and the fuel screw is 2.75 turns out. I replaced the water pump seal that fixed the leak there. New head gasket installed and timing is set to one tooth clock wise from OEM spec. Re-seated all connections for the wiring harness battery is fully charged. I cleaned the air filter all new fluids in it (high octane gas,50/50 anti freeze, ATV oil new oil filter). Also when I was putting the top end back together the ign. coil was rattling around so I put some silicone around the lip of it where it seats to the engine and it seems secure but still suspect.


The problems i'm still having- Went and rode it finally and it ran like a champ for about 15 min then started to bog and die anything past 1/4 throttle until it started to bog with any gas then I could not get it started and wound up pushing it 2 miles back to the trailer. I also noticed that when I would give it any gas when I was riding it would rev but it would sputter and cut out a bit then when I down shifted it would back fire. The fan is hooked back up to the sensors but will not turn on I took the sensors out of the radiator and cleaned them off since they were pretty dirty (I had it hard wired when I was riding to be safe). The lights only the left side works and comes on when it revs high. I've read and read all the forums on these and it seems to almost be an electrical problem vs. a carb problem. Any thoughts on all of this? ]]> Maintenance YFZAZ http://www.yfzcentral.com/forum/35-maintenance/144345-few-questions.html head problems http://www.yfzcentral.com/forum/32-yfz-powertrain/144329-head-problems.html Thu, 23 May 2013 00:56:32 GMT Hey everyone, long story...wanted to get ****ed by a dealer because i didnt have time to work on the 450 so anyway, went up there, got ****ed on... Hey everyone, long story...wanted to get ****ed by a dealer because i didnt have time to work on the 450 so anyway, went up there, got ****ed on price, started a huge issue with the company, now i have this.

I do most my work myself and i tore down my head because my baby wasnt starting right or when it did it ran funny. Thanks to the "repair work" from the dealer that is. Remember this os about 1hr of run time.. piston picture is pointless sorry but the powder is also more white.

So i got it down and these are the problems....

1st. It overheats. Put coolant in it and everything but it burns it off (so i believe) because it doesnt leak anywhere. I filled up the coolant a couple times so its definitely burning imo. The funny part is the fan doesnt come on and my temp stays right around 268 - 270 which is ****ing hot.

2nd. There is white powder (coolant i believe) everywhere. When i looked in my exhaust port all i saw was white shit. Pisses me off.. but anyway. in the pictures it looks darker but trust me, its more white.

I was going to do the valve seals and see if that made any difference because thats what they said it was and after my rebuild i build everything over...except the seals. But it ran 100% before it so i dont know why theyd be bad. Any advice would help.

ALSO, on a deadline so PLEASE HURRY!!!! i am planning on doing the seals in the next half hour so i need input asap. THANKS!

thanks again community,
Aaron

UPDATE

- after removing my valves and what not, i noticed that the burnt coolant residue is only (mainly) on one side of the exhaust valves. The other side has a little bit but most likely carried over. and the intake side has nothing. What does this mean?
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]]> YFZ Powertrain ownubackward http://www.yfzcentral.com/forum/32-yfz-powertrain/144329-head-problems.html Oil Mod. Where did .03-.035 hole size come from? Why not greater than or less than http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144321-oil-mod-where-did-03-035-hole-size-come-why-not-greater-than-less-than.html Thu, 23 May 2013 00:32:26 GMT I am doing the oil mod. Why was that size .03-.035 chose. I was going to do the jet but have successfully drilled a .043 hole and was wondering if I... I am doing the oil mod. Why was that size .03-.035 chose. I was going to do the jet but have successfully drilled a .043 hole and was wondering if I should just leave it. ]]> YFZCentral lounge! stang233 http://www.yfzcentral.com/forum/11-yfzcentral-lounge/144321-oil-mod-where-did-03-035-hole-size-come-why-not-greater-than-less-than.html Quick Handle bar question? http://www.yfzcentral.com/forum/102-suspension-steering/144305-quick-handle-bar-question.html Wed, 22 May 2013 22:28:38 GMT Does anyone know what bend handlebars are closest to stock yfz450r handlebars? I ordered yz high bends but dont like how low they are and how close... Does anyone know what bend handlebars are closest to stock yfz450r handlebars? I ordered yz high bends but dont like how low they are and how close the come to me. ]]> Suspension and Steering chad21000 http://www.yfzcentral.com/forum/102-suspension-steering/144305-quick-handle-bar-question.html popping when let off gas http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144289-popping-when-let-off-gas.html Wed, 22 May 2013 21:50:56 GMT Hi im new to yfz450 it came with full dg exhaust i just repacked it (still loud). Guy said it has jetted carb not sure what size. What can i look for... Hi im new to yfz450 it came with full dg exhaust i just repacked it (still loud). Guy said it has jetted carb not sure what size. What can i look for to fix the popping or is it normal? ]]> 04yfzz http://www.yfzcentral.com/forum/12-yfz450-yfz450r-general-talk/144289-popping-when-let-off-gas.html