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findley

yz450f wont idle when warm

10 posts in this topic

Hey guys first post and I am new to dirtbikes as well. I did make an effort to search my issue but I found nothing that related. If I missed the post for this I would be grateful if you could send me the right direction. My problem is this I bought an 06 yz 450 that was a racing bike but had all stock parts back on it. Right away i discovered when it got warmed up it wouldnt idle and the warmer it gets the higher i have to keep the idle, on one occasion it was 1/2 throttle. so far I have put in a new sparkplug, cleaned the carb multiple times, checked the valves, new fuel. It will idle with the choke on. I am almost convinced it is an electrical issue, any thoughts?

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Have the carb cleaned out by a reputable dealer. I have had issues with both a WR250F, and a YZ250F, and professional cleaning solved the problems.

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Hey guys first post and I am new to dirtbikes as well. I did make an effort to search my issue but I found nothing that related. If I missed the post for this I would be grateful if you could send me the right direction. My problem is this I bought an 06 yz 450 that was a racing bike but had all stock parts back on it. Right away i discovered when it got warmed up it wouldnt idle and the warmer it gets the higher i have to keep the idle, on one occasion it was 1/2 throttle. so far I have put in a new sparkplug, cleaned the carb multiple times, checked the valves, new fuel. It will idle with the choke on. I am almost convinced it is an electrical issue, any thoughts?

to me it still sounds like a carb issue. Either the pilot is plugged or it is the wrong size. When you say it was put back to stock, what sort of performance parts were on it?

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Have the carb cleaned out by a reputable dealer. I have had issues with both a WR250F, and a YZ250F, and professional cleaning solved the problems.

also, most of the time it is just a jet. It has always been easier for me to just buy new ones instead of trying to clean them which always fails for me.

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I have no idea what performance parts were put in the carb, I just assumed it had. I do know it had some other than factory exhaust on it. the pilot is a new 45, I also had a 48 in there and one of them quickshot 2 on there but it was no help

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I tried to start the bike tonight, used the choke it cranked right up. A little bit of coolant leaked from around the waterpump, probably something to do with it sitting for a couple weeks. any way after 30 seconds I turned the choke off and it continued to idle very high, I attempted to turn it down but nothing happened!!! no matter wich way 1 turn up or down did not affect the idle then it dropped and died. it cranked right back up but then died this continued for a while then I got mad and walked away, the pilet screw is backed out 3/4 turn. It may be a dirtyjet somewhere still, I dont want to believe it tho because I payed an atv repair guy a good chunk of money to clean it, twice. SO, should i take it to a yamaha dealer and know it was cleaned right, or take another course of action?

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Thank you for the suggestions, I ended up taking it to a dealer to be repaired. the problem was indeed a dirty jet in the accelerator pump. they said they had to pull the carb off twice before they finally got it clean. total bill $118, lesson learned.

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