06' carb issues - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

patrickhunter614 · 09-02-2010, 08:53 PM

I just bought an 06 yfz450, sometimes when i get it running, it will start to idle high and stick there, the choke is not out or anything like that, so i let out the clutch a little and it will idle back down, but after a little running around it will do it again...dont know what it is?

Also when i punch it the first 0-1/4 throttle will bog down and it wont go anywhere, i have to ease into the throttle, not sure what jets or anything are on it, but i think it might be the pilot jet, if anyone can help that would be great. It has a hmf slip on exhaust and no air filter cover, the previous owner said he redid the motor too, new piston and cyliner wall and all that. I want this quad to run good, but it hasnt been and it keeps dying on me and taking a while to start back up! Please HELP!

yfz450jr · 09-03-2010, 04:05 AM

you need to clean your carbs, take out the jets clean them real good

and you need to do the zip tie mod to your carb so it can eliminate that bog

ae13291 · 09-03-2010, 04:54 AM

did you clean the carb slide with brake parts cleaner? if you are going to clean the carb use only gas, anything else can damage the coating on the slide. you need to do the zip tie mod maybe change the leak jets and actually do some jetting work and adjust the idle

XxROCKSTArxX69 · 09-03-2010, 12:22 PM

same as me mine does the same thing i did the ziptie mod a 45 pilot and the 35 leak jet to fix the bog and still bogs and idles up high unless you pull in the clutch and let go of it it only works sometimes someone said that maybe your main is to lean idk how im running a 165 main 4th clip on the needle but it goes perfect eveywhere else

ae13291 · 09-03-2010, 02:36 PM

^^^ the up high idling problem is from the little air fuel mixture needle you adjust with your fingers. adjust that screw till you achive the highest rpm and then lower your idle speed to a desired level and bamm problem should be fixed. after i got the R&D power pump i have no more bog on mine, i could peg the throttle fast and will rev up fine. chenge leak jet settings, but make sure your pilot and main are adjusted correctly beore touching the leakjet

patrickhunter614 · 09-03-2010, 10:28 PM

Well it looks like i cant even mess with the carb right now, i went riding today and about 20 min into the ride, my motor just shut down and i skidded to a stop, looked down and oil had sprayed out on by boots , it appeared to be coming from the lower gasket on the motor, but im not quite sure, when i first got the quad i changed the oil and it looked like it had coolant in it, i was kind of nervous about it but i figured after one ride i would check it again. The guy i bought it from said that he had previously shot the piston through the cylinder wall and had it all professionally replaced and fixed, pretty sure that was a lie. But now even when i try and move the bike, the back tires are still locked up and holding in the cluch wont do anything. If anyone has any clue as to what this might be i can provide more details or pictures, any help would be appreciated!

09-02-2010, 08:53 PM	#1 (permalink)
patrickhunter614 Junior Member Join Date: Aug 2010 Posts: 9	06' carb issues I just bought an 06 yfz450, sometimes when i get it running, it will start to idle high and stick there, the choke is not out or anything like that, so i let out the clutch a little and it will idle back down, but after a little running around it will do it again...dont know what it is? Also when i punch it the first 0-1/4 throttle will bog down and it wont go anywhere, i have to ease into the throttle, not sure what jets or anything are on it, but i think it might be the pilot jet, if anyone can help that would be great. It has a hmf slip on exhaust and no air filter cover, the previous owner said he redid the motor too, new piston and cyliner wall and all that. I want this quad to run good, but it hasnt been and it keeps dying on me and taking a while to start back up! Please HELP!

09-03-2010, 04:05 AM	#2 (permalink)
yfz450jr Senior Member Join Date: Dec 2008 Location: California Posts: 493	you need to clean your carbs, take out the jets clean them real good and you need to do the zip tie mod to your carb so it can eliminate that bog __________________ 2006 YFZ450

09-03-2010, 04:54 AM	#3 (permalink)
ae13291 Senior Member Join Date: Jun 2009 Location: san fernando valley,CA Posts: 311	did you clean the carb slide with brake parts cleaner? if you are going to clean the carb use only gas, anything else can damage the coating on the slide. you need to do the zip tie mod maybe change the leak jets and actually do some jetting work and adjust the idle __________________ 2004 YFZ450 red on white plastics. 2002 honda 400ex

09-03-2010, 12:22 PM	#4 (permalink)
XxROCKSTArxX69 Senior Member Join Date: May 2010 Location: CT Posts: 352	same as me mine does the same thing i did the ziptie mod a 45 pilot and the 35 leak jet to fix the bog and still bogs and idles up high unless you pull in the clutch and let go of it it only works sometimes someone said that maybe your main is to lean idk how im running a 165 main 4th clip on the needle but it goes perfect eveywhere else __________________ 2006 yfz 450 8\|35 leak, 165 main, 45 pilot 12.5:1 piston..........nerfs hetrick's national exhaust w/shorty hot rods crank(i believe) ported head oversized valves cams ( not sure what kind) vortex ignition K&N filter zip tie carb mod....throttle spring mod works triple rate front shocks spastic designs graphics aftermarket plastics wheel spacers

09-03-2010, 02:36 PM	#5 (permalink)
ae13291 Senior Member Join Date: Jun 2009 Location: san fernando valley,CA Posts: 311	^^^ the up high idling problem is from the little air fuel mixture needle you adjust with your fingers. adjust that screw till you achive the highest rpm and then lower your idle speed to a desired level and bamm problem should be fixed. after i got the R&D power pump i have no more bog on mine, i could peg the throttle fast and will rev up fine. chenge leak jet settings, but make sure your pilot and main are adjusted correctly beore touching the leakjet __________________ 2004 YFZ450 red on white plastics. 2002 honda 400ex Last edited by ae13291; 09-03-2010 at 02:39 PM.

09-03-2010, 10:28 PM	#6 (permalink)
patrickhunter614 Junior Member Join Date: Aug 2010 Posts: 9	Well it looks like i cant even mess with the carb right now, i went riding today and about 20 min into the ride, my motor just shut down and i skidded to a stop, looked down and oil had sprayed out on by boots , it appeared to be coming from the lower gasket on the motor, but im not quite sure, when i first got the quad i changed the oil and it looked like it had coolant in it, i was kind of nervous about it but i figured after one ride i would check it again. The guy i bought it from said that he had previously shot the piston through the cylinder wall and had it all professionally replaced and fixed, pretty sure that was a lie. But now even when i try and move the bike, the back tires are still locked up and holding in the cluch wont do anything. If anyone has any clue as to what this might be i can provide more details or pictures, any help would be appreciated!

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