Question about 2003 Yamaha YZ 250

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2003 YZ250 engine coughs and sputters at high RPM

My engine runs fine through low and mid rpm's but when I start to open her up and it gets to the higher revs it starts to cough and sputter, almost as if I pulled the choke on during acceleration. I have done a comp. test and it was fine-160 P.S.I,my reeds appear to be fine, my sparkplug is very black but DRY, no smoking from exhaust except for normal output. I know my way around motorcycles but i'm stumped, could it be a fuel/carb problem, or an electrical/ignition problem? I hope somebody can help thanx

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Fuel carburetor problem! it causes most of the spluttering problems i have encountered with mine so far!
it could have blockage and insufficient gas enters on it during high revs!

Posted on Jun 18, 2009

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You have a slightly gummed up carb. I would get a can of carb. cleaner that you add to the fuel and hope that running that through the carb in a couple of tanks of gas will solve your problem.

Posted on Jun 18, 2009

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