Jetting 101. - Page 2 - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

skatpex99 · 12-04-2006, 10:26 PM

Thanks for this. Helped me alot. When i get my new pipe and fci intake i will not have to take it to the dealer to jet it. Thanks

SandStar450 · 12-24-2006, 02:56 AM

yes!!!!!!!! I;lll be able to jet my quad for the first time!!!!!!!!!!

jjw0485 · 01-03-2007, 02:21 PM

Thanks for this how to rejet thread. Very helpful. Made the job alot easier. Great work!!!!

I have a new bone stock 2007 yfz450 (first yamaha quad) with a very fustrating bog off idle. Most threads I have seen acknoledge this and say to rejet and change to 4th clip position on the needle.

I could not rotate the carb enough to access it. Looks like its hitting something. I had to remove it from the engine. Not terrible but a little more involved. I also noticed that my 2007 needle is not adjustable. Only one clip position. I rejetted the pilot and main (now at 45/16

but I am stumped on the needle. Some say to shim it, I am not familiar with shimming. Will a 2006 needle work in a 2007? Any help? The bog lessoned with the rejetting but still stubbles when stabbing the throttle just off idle. My next step is to figure out how to shim the needle and add a power now unit.

I want to make this bog go away completley on my 2007. Does race gas help. I am using pumped gas at 93 octane.

insanejackson · 01-05-2007, 08:40 PM

I'm having that problem right now with my 06. I have a full HMF exhaust with 50 pilot and 175 main (had a 180 but changed it when the temp hit 105 everyday here in Dallas). Everything seems to be working right through all RPMs, the only problem I have is a stumble when stabbing the thottle right off of idle. I was thinking about adjusting the fuel mixture screw.
Anyone have any thoughts?

DuneFZ · 01-07-2007, 12:11 AM

Okay... This might sound like a very dumb question, but here it goes. If I want to put the clip in #5 postion am I placing the clip on the 5 th postion from the bottom of the needle or the 5 th postion from the top of the needle. I am thinking from the bottom to richen it (allowing more to pass). By the way I have a GYTR kit

gas it!! · 01-12-2007, 02:48 PM

bumping this the top so i can find it easier this weekend.

YFZ450Lynx · 01-12-2007, 06:31 PM

Quote:

bumping this the top so i can find it easier this weekend.
[/b]

Silly "Gas it!!" :) this topic is a sticky already on the top and always will be.

gas it!! · 01-22-2007, 04:08 PM

ha! lucky me

oraugas · 01-22-2007, 09:58 PM

I have an 06 YFZ450. I currently have a curtis sparks shorty exhaust, cam mod, lid off, K&N filter kit, needle set on 4th clip down, 162 main, 45 pilot, air screw at 2 turns.
I race mx and as I am sitting at the gate giving it gas, the gate drops and it floods and dies. What should my settings be?

popohamwich · 01-24-2007, 09:20 PM

I'm no expert but compared to everyone else's recommendations your main is too small. According to the Jetting FAQ you should be at a 168 main and 2.5 turns out on the fuel screw. Alot of people are going bigger than 168 though... just check the jetting faq thread.

jmess · 03-12-2007, 04:49 PM

Quote:

Thanks for this how to rejet thread. Very helpful. Made the job alot easier. Great work!!!!

I have a new bone stock 2007 yfz450 (first yamaha quad) with a very fustrating bog off idle. Most threads I have seen acknoledge this and say to rejet and change to 4th clip position on the needle.

I could not rotate the carb enough to access it. Looks like its hitting something. I had to remove it from the engine. Not terrible but a little more involved. I also noticed that my 2007 needle is not adjustable. Only one clip position. I rejetted the pilot and main (now at 45/16

but I am stumped on the needle. Some say to shim it, I am not familiar with shimming. Will a 2006 needle work in a 2007? Any help? The bog lessoned with the rejetting but still stubbles when stabbing the throttle just off idle. My next step is to figure out how to shim the needle and add a power now unit.

I want to make this bog go away completley on my 2007. Does race gas help. I am using pumped gas at 93 octane.[/b]

This is more for reference than anything, on the 2007 I think things are alittle tighter than earlier years. I rejetted and popped out the fuel screw plug on mine this weekend and I had to remove the airbox, and unbolt the rear brake fluid resevoir to get the carb pulled from the motor. I tried to just loosen up the clamps on each side of the carb but when I would turn it there is a bolt on top of the choke that hits the upper motor mount. When turning it away from me towards the rear brake it would hit the resevoir. Just takes alittle more playing around than I expected. Went smoothly other than that.

metoo · 03-12-2007, 09:11 PM

I just bought a LRD full system and it says to use a 55 pilot, 165 main, and 6th on the clip.
WTF?

mrshbr · 03-16-2007, 11:29 PM

Jetting 101 is awesome! Thanks for the info! It really helped out! Also thanks to TERSEJR. You are a god thanks for youre info!!

My bike is now jetted with a GYT-R air filter as well!

v8teezer · 04-05-2007, 08:08 PM

Jetting my bike this weekend. After reading this thread I feel very confident in doing it for the first time. Good Job on the write up! I'm going with a 45 pilot and a 165 main.

popohamwich · 04-14-2007, 06:31 PM

The 2007 models do seem ALOT tighter. I accidently removed the actual black TPS switch because I misread the directions. Hope I didn't mess anything up. This will be my second time rejetting (I had the same problem as a couple others with the stock needle not being adjustable the first time I jetted.) So now I've got an nvcq needle and I wanted to try doing this without removing the carb but I don't think it's going to happen. If anyone knows how to get the carb to spin on a 2007 please share. It's pissing me off the amount of time I have to spend doing this.

KyleG · 04-28-2007, 05:39 PM

Im jeting a 07 this weekend for the first time. by the sounds of things im not even going to try the needle. im at 1000ft, going to try a 165 or main and a 45p. Then when the muffler gets here check and see how a 168 works. no problems with bogging of idle too bad, but running too lean. My plug is all most white!

KyleG · 04-29-2007, 01:12 PM

So has anyone done a 07 that didnt have to take the carb out? I tried everything, but to get at the needle its gonna have to come out. whats the best way to do this? I know this is going to be a dumb question to most, but what is the black hose on the break side for? can it be disconected with no problems? any other tips or tricks for this job?
Thanks!
By the way, just changed out the main to a 165 from 155. now im bogging off idle. thats the only change so far.

Ringhale · 05-15-2007, 12:36 AM

So are there 2 TPS switches? In step 2 it says remove carb and TPS then the last picture says don't spin or remove thanks for any help

**Duane** · 05-15-2007, 07:25 AM

Quote:

So are there 2 TPS switches? In step 2 it says remove carb and TPS then the last picture says don't spin or remove thanks for any help[/b]

Only one TPS switch on the carb. There are a totl of two switches...one is the TPS and the other is the carb switch. The carb switch is the smaller of the plugs. If you have a newer model YFZ the plugs may be a different color (brown I think).

yfz/700R · 05-28-2007, 01:35 AM

i'm running a ronwoods and a alba pipe an a 06 yfz my jetting now is 178 main 48 pilot and stock needle,stock fuel screw and it seems to run perfect for 0 to 500' elevation at 60 to 80 deg weather in the desert but now its 90 to 105 in the desert were i ride, same elevation....
is there a general rule of thumb to drop down/go up in jet sizes for different weather temps?
thanks in advance

12-04-2006, 10:26 PM	#21 (permalink)
skatpex99 Senior Member Join Date: Nov 2006 Location: Miami Posts: 551	Thanks for this. Helped me alot. When i get my new pipe and fci intake i will not have to take it to the dealer to jet it. Thanks __________________ 06 special edition Cam mod Pro peg nerfs Soon to have nmotion exhaust and fci intake

01-05-2007, 08:40 PM	#24 (permalink)
insanejackson Member Join Date: Jan 2006 Posts: 61	I'm having that problem right now with my 06. I have a full HMF exhaust with 50 pilot and 175 main (had a 180 but changed it when the temp hit 105 everyday here in Dallas). Everything seems to be working right through all RPMs, the only problem I have is a stumble when stabbing the thottle right off of idle. I was thinking about adjusting the fuel mixture screw. Anyone have any thoughts? __________________ 06 YFZ450 Bill Ballance Ed. - Black powdercoated effects - Powermadd handguards - Razr II rears - Full HMF BB carbon fiber exaust system - Pro Flow Design air intake kit with Uni filter

01-07-2007, 12:11 AM	#25 (permalink)
DuneFZ Member Join Date: Dec 2006 Location: Medford OR Posts: 61	Okay... This might sound like a very dumb question, but here it goes. If I want to put the clip in #5 postion am I placing the clip on the 5 th postion from the bottom of the needle or the 5 th postion from the top of the needle. I am thinking from the bottom to richen it (allowing more to pass). By the way I have a GYTR kit __________________ http://www.myspace.com/kingraptor1

03-16-2007, 11:29 PM	#33 (permalink)
mrshbr Senior Member Join Date: Mar 2007 Location: Tacoma, WA Posts: 883	Jetting 101 is awesome! Thanks for the info! It really helped out! Also thanks to TERSEJR. You are a god thanks for youre info!! My bike is now jetted with a GYT-R air filter as well! __________________ <div align="center"> <span style="color:#FF00FF"><span style="font-family:Century Gothic">Myspace AIM- YamahaMamablu Yahoo- Mrs_hbr <div align="center">2007 YFZ 450 Blue with Jardine RT-4 exhaust, GYTR filter, CAM MOD, 8k HIDs, Trail Tech Bar Clamp & 100w Stator and Pro Armor Nerfs <span style="color:#000000">Signature made by Sidewinder

04-28-2007, 05:39 PM	#36 (permalink)
KyleG Senior Member Join Date: Apr 2007 Location: Alberta Posts: 224	Im jeting a 07 this weekend for the first time. by the sounds of things im not even going to try the needle. im at 1000ft, going to try a 165 or main and a 45p. Then when the muffler gets here check and see how a 168 works. no problems with bogging of idle too bad, but running too lean. My plug is all most white! __________________ 07 YFZ 450 DASA Exhaust, Hot Cams, GYTR Intake, Wiesco 13-1 Hi Comp, Ported, Custom graphics.

12-24-2006, 02:56 AM	#22 (permalink)
SandStar450 Member Join Date: Oct 2006 Posts: 37	yes!!!!!!!! I;lll be able to jet my quad for the first time!!!!!!!!!!

01-03-2007, 02:21 PM	#23 (permalink)
jjw0485 Junior Member Join Date: Jan 2007 Location: New Jersey Posts: 15	Thanks for this how to rejet thread. Very helpful. Made the job alot easier. Great work!!!! I have a new bone stock 2007 yfz450 (first yamaha quad) with a very fustrating bog off idle. Most threads I have seen acknoledge this and say to rejet and change to 4th clip position on the needle. I could not rotate the carb enough to access it. Looks like its hitting something. I had to remove it from the engine. Not terrible but a little more involved. I also noticed that my 2007 needle is not adjustable. Only one clip position. I rejetted the pilot and main (now at 45/16 but I am stumped on the needle. Some say to shim it, I am not familiar with shimming. Will a 2006 needle work in a 2007? Any help? The bog lessoned with the rejetting but still stubbles when stabbing the throttle just off idle. My next step is to figure out how to shim the needle and add a power now unit. I want to make this bog go away completley on my 2007. Does race gas help. I am using pumped gas at 93 octane.

01-12-2007, 02:48 PM	#26 (permalink)
gas it!! Senior Member Join Date: Jan 2007 Location: Torrance, CA Posts: 1,475	bumping this the top so i can find it easier this weekend.

01-22-2007, 04:08 PM	#28 (permalink)
gas it!! Senior Member Join Date: Jan 2007 Location: Torrance, CA Posts: 1,475	ha! lucky me

01-22-2007, 09:58 PM	#29 (permalink)
oraugas Member Join Date: Oct 2005 Posts: 83	I have an 06 YFZ450. I currently have a curtis sparks shorty exhaust, cam mod, lid off, K&N filter kit, needle set on 4th clip down, 162 main, 45 pilot, air screw at 2 turns. I race mx and as I am sitting at the gate giving it gas, the gate drops and it floods and dies. What should my settings be?

01-24-2007, 09:20 PM	#30 (permalink)
popohamwich Junior Member Join Date: Nov 2006 Posts: 19	I'm no expert but compared to everyone else's recommendations your main is too small. According to the Jetting FAQ you should be at a 168 main and 2.5 turns out on the fuel screw. Alot of people are going bigger than 168 though... just check the jetting faq thread.

03-12-2007, 09:11 PM	#32 (permalink)
metoo Junior Member Join Date: Sep 2004 Posts: 19	I just bought a LRD full system and it says to use a 55 pilot, 165 main, and 6th on the clip. WTF?

04-05-2007, 08:08 PM	#34 (permalink)
v8teezer Senior Member Join Date: Apr 2007 Location: Kansas Posts: 148	Jetting my bike this weekend. After reading this thread I feel very confident in doing it for the first time. Good Job on the write up! I'm going with a 45 pilot and a 165 main.

04-14-2007, 06:31 PM	#35 (permalink)
popohamwich Junior Member Join Date: Nov 2006 Posts: 19	The 2007 models do seem ALOT tighter. I accidently removed the actual black TPS switch because I misread the directions. Hope I didn't mess anything up. This will be my second time rejetting (I had the same problem as a couple others with the stock needle not being adjustable the first time I jetted.) So now I've got an nvcq needle and I wanted to try doing this without removing the carb but I don't think it's going to happen. If anyone knows how to get the carb to spin on a 2007 please share. It's pissing me off the amount of time I have to spend doing this.

04-29-2007, 01:12 PM	#37 (permalink)
KyleG Senior Member Join Date: Apr 2007 Location: Alberta Posts: 224	So has anyone done a 07 that didnt have to take the carb out? I tried everything, but to get at the needle its gonna have to come out. whats the best way to do this? I know this is going to be a dumb question to most, but what is the black hose on the break side for? can it be disconected with no problems? any other tips or tricks for this job? Thanks! By the way, just changed out the main to a 165 from 155. now im bogging off idle. thats the only change so far. __________________ 07 YFZ 450 DASA Exhaust, Hot Cams, GYTR Intake, Wiesco 13-1 Hi Comp, Ported, Custom graphics.

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05-15-2007, 12:36 AM	#38 (permalink)
Ringhale Member Join Date: Aug 2006 Location: Michigan Posts: 53	So are there 2 TPS switches? In step 2 it says remove carb and TPS then the last picture says don't spin or remove thanks for any help __________________ 92 RM125 03 636 Hindle Slip-On 06 YFZ450, -HMF Sport Slip-on, Lid off, Dynojet jet kit, PowerMadd hand guards, Pro-Armor Dominator Bumper, Pro-Armor Fat Peg Nerfs

05-28-2007, 01:35 AM	#40 (permalink)
yfz/700R Member Join Date: Nov 2005 Posts: 67	i'm running a ronwoods and a alba pipe an a 06 yfz my jetting now is 178 main 48 pilot and stock needle,stock fuel screw and it seems to run perfect for 0 to 500' elevation at 60 to 80 deg weather in the desert but now its 90 to 105 in the desert were i ride, same elevation.... is there a general rule of thumb to drop down/go up in jet sizes for different weather temps? thanks in advance