Spring Mod Full Tutorial - Page 2 - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

Joester · 06-30-2009, 12:45 PM

QUOTE (ae13291 @ Jun 21 2009, 02:35 AM)

Quote:

whats the purpose of the leak jet? and should we adjust that spring loaded screw more out? the screw that is pushing on the black plastic piece[/b]

the leak jet is like and over flow jet... it lets gas not used for the accelerator pump go back into the bowl... so a smaller leak jet (stock is 40) lets less gas go back in the bowl and in turn makes MORE gas go through the accelerator pump.

and adjusting the screw gives the accelerator pump linkage less travel and thus less gas, the spring and zip tie mod do the same thing, but without shortening the travel.

snogibson · 07-06-2009, 02:34 PM

perfect write up i might give it a shot

quadboy-55 · 07-06-2009, 03:06 PM

looks good! might try this one out too! excellent write up!

just a quick Question tho, ive seen product evaluations about the scary fast quickshot and the boysen acellerator pump, along with bigger float bowls/ adjustable leak jets, and what not, but i was wondering, if you ever had the time to try one of these ''bog killing'' mods compared to youre spring mod. i'd just like to see how they compare before jumping head first into my carb.

Joester · 07-07-2009, 10:51 PM

QUOTE (quadboy-55 @ Jul 6 2009, 11:06 AM)

Quote:

looks good! might try this one out too! excellent write up!

just a quick Question tho, ive seen product evaluations about the scary fast quickshot and the boysen acellerator pump, along with bigger float bowls/ adjustable leak jets, and what not, but i was wondering, if you ever had the time to try one of these ''bog killing'' mods compared to youre spring mod. i'd just like to see how they compare before jumping head first into my carb.[/b]

i dont have one, but i have heard that they work the best.. completely curing the bike of any noticable bog.. and i would definitely get one if i had the money. the spring mod is free though.

by all means get a powerbowl or something similar if you feel like makin' it rain.

quadboy-55 · 07-07-2009, 11:00 PM

QUOTE (Joester @ Jul 7 2009, 07:51 PM)

Quote:

i dont have one, but i have heard that they work the best.. completely curing the bike of any noticable bog.. and i would definitely get one if i had the money. the spring mod is free though.

by all means get a powerbowl or something similar if you feel like makin' it rain.[/b]

yeah, the spring mod does sound good, but i think i might give a power bowl a try.

BLR STS · 08-18-2009, 04:39 PM

Im attempting to do this right now and im at the part where you take the thin shaft thing out and have to "wiggle" the black thing out. I cannot figure out how to "wiggle" the black piece out and dont want to take anything off and screw up. Any help much appreciated. Thanks.

Joester · 08-18-2009, 10:45 PM

you take off the E-clip and the spring wrapped around the black part? dont be afraid to bend the spring either... after all it IS a spring.

smootrc · 09-14-2009, 04:51 AM

tired this mod on my 05 and the cover with the 3 screws has no orings and didnt see the spring you was talking about. does this apply to certain years? also my carb looked different from the pictures

popeto93 · 11-03-2009, 08:04 PM

hahah nice post man, good job , i just did this like 2-3 days ago, i hate messin with teh carb its such a pain

Joester · 11-03-2009, 10:52 PM

lol, yeah carbs are confusing... so many little parts.

to tosubie if its not too late... as far as i know the carbs are all basically the same. the previous owner (if there WAS a previous owner) may have done something?

dsz5014 · 12-03-2009, 07:05 PM

http://www.motorcycle-superstore.com/4/23/...Z450-Parts.aspx

has anyone used this on their bikes my friend offered me on for like twenty bucks
or this

http://www.motorcycle-superstore.com/4/23/...Z450-Parts.aspx

Joester · 12-03-2009, 10:30 PM

yes, that fixes it too, but its $103 more expensive.

polishprince0052 · 05-10-2010, 08:00 PM

First off, GREAT WORK! That really makes it easy... However my question is if you do an aftermarket exhaust and re-jet does this also cure the bog? Or is this simple fix also necessary? I will probably do it anyway since I'm going to have the carb out and apart to re-jet when I put the aftermarket exhaust on. Just curious if there will be anything negative to this fix if I re-jet with a aftermarket pipe.

chevy*tough · 05-22-2010, 11:48 AM

my rig has the quickshot when i bought it and i still noticed the bog but yesterday i did this mod and im pretty sure it is mostly gone. Probley needs some jet work!

ladygaggag · 09-03-2010, 04:43 AM

So the boyesen quickshot 3 still doesn't cure all of the bogging? Doing the spring mod to will most likely solve it? Also downsizing the leak jet from stock 40 to a 35 is this necessary for all of our quads if we have the carb torn down? To do. Doesn't matter what all mods you have done should do it if you have the chance?

sam68 · 09-03-2010, 11:38 AM

Quote:

Originally Posted by ladygaggag

So the boyesen quickshot 3 still doesn't cure all of the bogging? Doing the spring mod to will most likely solve it? Also downsizing the leak jet from stock 40 to a 35 is this necessary for all of our quads if we have the carb torn down? To do. Doesn't matter what all mods you have done should do it if you have the chance?

I am not sure about the Boyesen but I have an R&D power bowl and if it's like theirs it has an adjustable leak jet. My Power bowl also came with a new stiffer spring so no moding necessary.

snogibson · 09-03-2010, 12:01 PM

Quote:

Originally Posted by ladygaggag

So the boyesen quickshot 3 still doesn't cure all of the bogging? Doing the spring mod to will most likely solve it? Also downsizing the leak jet from stock 40 to a 35 is this necessary for all of our quads if we have the carb torn down? To do. Doesn't matter what all mods you have done should do it if you have the chance?

if you have a QS3 and your bike is still bogging get a adjustable fuel screw and get your jetting closer then fiddle with them till it goes away

prang11 · 09-08-2010, 05:28 PM

Great walk through, thanks for the info.

joshsdaddy · 10-10-2010, 10:51 AM

Smootrc you got a problem. I have an 05 and trust me. There is a spring and o-rings inside the pump. I just did the spring mod yesterday, and also installed a Quickshot 3. The bog is TOTALLY gone. But the throttle is still hard. Gonna get the replacement spring. DID the cam mod right away also. MAN did that wake the motor up. Definitly worth the time.

skyline2 · 10-17-2010, 02:15 PM

can i do the tip tie mod and this mod or r they the same thing?

07-06-2009, 02:34 PM	#22 (permalink)
snogibson Senior Member Join Date: Mar 2009 Location: Silverton Oregon Posts: 1,066	perfect write up i might give it a shot __________________

07-06-2009, 03:06 PM	#23 (permalink)
quadboy-55 Senior Member Join Date: May 2009 Location: Somewhere in Canada Posts: 1,486	looks good! might try this one out too! excellent write up! just a quick Question tho, ive seen product evaluations about the scary fast quickshot and the boysen acellerator pump, along with bigger float bowls/ adjustable leak jets, and what not, but i was wondering, if you ever had the time to try one of these ''bog killing'' mods compared to youre spring mod. i'd just like to see how they compare before jumping head first into my carb. __________________ Don't drink and drive..... You might hit a bump and spill!

08-18-2009, 10:45 PM	#27 (permalink)
Joester Senior Member Join Date: Feb 2009 Location: High Ridge, outside St. Louis, MO Posts: 2,347	you take off the E-clip and the spring wrapped around the black part? dont be afraid to bend the spring either... after all it IS a spring. __________________ 2007 YFZ450 Red/Gray - DMC Afterburner Comp full system - Pro Design Pro Flow intake and air filter - CP 12.75:1 piston - port work by Outlaw Innovations - Stage 2 HotCams - EHS Racing airbox lid - AC racing blackline nerfs - TAG metals black bumper - bent accelerator pump spring - Adjustable Fuel screw - Maxxis RAZRs all around - 15/38 gears

09-14-2009, 04:51 AM	#28 (permalink)
smootrc Senior Member Join Date: Sep 2009 Location: Odessa, MO Posts: 152	tired this mod on my 05 and the cover with the 3 screws has no orings and didnt see the spring you was talking about. does this apply to certain years? also my carb looked different from the pictures __________________ 05 YFZ450 Eddie Sanders 98mm Big Bore, 12.5: 1 CP Piston, Hinson Clutch, Cam Mod, 42mm Carb, FCI Intake, K&N Filter, Full Rossier Exhaust, Carb Spring Mod, HO Stator & HID headlight kit +4 swinger, +2 A-Arms, Current work - porting head 07 white dodge 2500 diesel w/22'' matte black KMC monsters 03 Chevy S10 on 22's

11-03-2009, 08:04 PM	#29 (permalink)
popeto93 Senior Member Join Date: Oct 2009 Location: 18940 Posts: 126	hahah nice post man, good job , i just did this like 2-3 days ago, i hate messin with teh carb its such a pain __________________ Houser +1 steering stem with houser bar clamp

08-18-2009, 04:39 PM	#26 (permalink)
BLR STS Member Join Date: Oct 2008 Posts: 75	Im attempting to do this right now and im at the part where you take the thin shaft thing out and have to "wiggle" the black thing out. I cannot figure out how to "wiggle" the black piece out and dont want to take anything off and screw up. Any help much appreciated. Thanks.

11-03-2009, 10:52 PM	#30 (permalink)
Joester Senior Member Join Date: Feb 2009 Location: High Ridge, outside St. Louis, MO Posts: 2,347	lol, yeah carbs are confusing... so many little parts. to tosubie if its not too late... as far as i know the carbs are all basically the same. the previous owner (if there WAS a previous owner) may have done something? __________________ 2007 YFZ450 Red/Gray - DMC Afterburner Comp full system - Pro Design Pro Flow intake and air filter - CP 12.75:1 piston - port work by Outlaw Innovations - Stage 2 HotCams - EHS Racing airbox lid - AC racing blackline nerfs - TAG metals black bumper - bent accelerator pump spring - Adjustable Fuel screw - Maxxis RAZRs all around - 15/38 gears

12-03-2009, 07:05 PM	#31 (permalink)
dsz5014 Member Join Date: Nov 2009 Location: Houtzdale, PA Posts: 30	http://www.motorcycle-superstore.com/4/23/...Z450-Parts.aspx has anyone used this on their bikes my friend offered me on for like twenty bucks or this http://www.motorcycle-superstore.com/4/23/...Z450-Parts.aspx __________________ '07 YFZ450 Twin Air billet intake plate GYTR High Flow Air Filter GYTR Outerwear filter TPS Bypass Plug Cam Mod HMF Slip on Monster Energy Graphics To come..... High comp piston FCI Intake

12-03-2009, 10:30 PM	#32 (permalink)
Joester Senior Member Join Date: Feb 2009 Location: High Ridge, outside St. Louis, MO Posts: 2,347	yes, that fixes it too, but its $103 more expensive. __________________ 2007 YFZ450 Red/Gray - DMC Afterburner Comp full system - Pro Design Pro Flow intake and air filter - CP 12.75:1 piston - port work by Outlaw Innovations - Stage 2 HotCams - EHS Racing airbox lid - AC racing blackline nerfs - TAG metals black bumper - bent accelerator pump spring - Adjustable Fuel screw - Maxxis RAZRs all around - 15/38 gears

05-10-2010, 08:00 PM	#33 (permalink)
polishprince0052 Junior Member Join Date: May 2010 Posts: 8	First off, GREAT WORK! That really makes it easy... However my question is if you do an aftermarket exhaust and re-jet does this also cure the bog? Or is this simple fix also necessary? I will probably do it anyway since I'm going to have the carb out and apart to re-jet when I put the aftermarket exhaust on. Just curious if there will be anything negative to this fix if I re-jet with a aftermarket pipe.

05-22-2010, 11:48 AM	#34 (permalink)
chevy*tough Junior Member Join Date: Oct 2009 Posts: 8	my rig has the quickshot when i bought it and i still noticed the bog but yesterday i did this mod and im pretty sure it is mostly gone. Probley needs some jet work! __________________ The RIDE: 06 YFZ 450 Blue, Graphic kit, Boysen Quickshot, FMF Pipe, Nerf bars, Handle Bar Risers, Hand Guards! The RIG: 01 Chevy lb7, 145,000 miles, AMSOIL Equipped, Silverline 4in w/5" tip, EFI Live, ISS Pro pyro and boost gauges, sitting on 265 nitto terra grapplers. Member/Sponser on Duramax forum: chevy*tough

09-03-2010, 04:43 AM	#35 (permalink)
ladygaggag Member Join Date: Aug 2010 Posts: 32	So the boyesen quickshot 3 still doesn't cure all of the bogging? Doing the spring mod to will most likely solve it? Also downsizing the leak jet from stock 40 to a 35 is this necessary for all of our quads if we have the carb torn down? To do. Doesn't matter what all mods you have done should do it if you have the chance?

09-08-2010, 05:28 PM	#38 (permalink)
prang11 Junior Member Join Date: Jul 2006 Posts: 22	Great walk through, thanks for the info.

10-10-2010, 10:51 AM	#39 (permalink)
joshsdaddy Senior Member Join Date: Sep 2010 Location: Nanticoke,PA Posts: 630	Smootrc you got a problem. I have an 05 and trust me. There is a spring and o-rings inside the pump. I just did the spring mod yesterday, and also installed a Quickshot 3. The bog is TOTALLY gone. But the throttle is still hard. Gonna get the replacement spring. DID the cam mod right away also. MAN did that wake the motor up. Definitly worth the time.

10-17-2010, 02:15 PM	#40 (permalink)
skyline2 Member Join Date: Sep 2008 Location: sutton ma Posts: 63	can i do the tip tie mod and this mod or r they the same thing?

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