Question about 2003 Yamaha YZ 250

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Won't idle steadily

1998 yamaha timberwolf 250 atv
all of a sudden won't idle steadily - cleaned carb, fresh gas, new spark plug, new air filter.
rpm fluctuates and engine will cut off if don't constantly fluctuate choke,
any leads greatly appreciated.
thx

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  • davidtaylor Nov 13, 2008

    no. I have been running it regularly (but conservatively, no big mud etc.) then one day start it and bam, won't idle. float seems to travel freely when disassembled - can it get stuck when operating? Needle? bad choke somehow? I dunno

  • Anonymous Dec 14, 2008

    about all yamaha timberwolfs have the same problems. i have done all the basic fixes that have to do with air and gas fow throuogh the sprak plug all i can do now is change the carb and go from there it just dosent seem tto choke

  • Anonymous Apr 27, 2009

    Having the same problem with my 92 Timberwolf. Replaced the carb and it didn't help... now we are down to full engine re-work:(

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Check the rubber boot that joins the carby to the engine to often have seen the hose clamps over tightened therefore creating a split in the rubber letting to much air in giving the rough idle eventually you wont be able to start it at all (have a good thorough look inside an outside of boot doesnt take much)

Posted on May 22, 2009

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Did it have old gas in it for any amount of time

Posted on Nov 12, 2008

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98 Timberwolf will not idle and has a rolling rattle sound in crank case sound dose not change when you throttle it up

Posted on Jun 28, 2009

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