Question about 2003 Yamaha YZ 250
The engine only runs half throttle smokes blue and sometimes black it has a new carb if u let off the gas it dies immediatly
So, can you tell me what kind of carb was on the bike before? was it factory? and what kind of carb was just installed? blue smoke can be caused by burning transmission oil or a rich fuel mixture. that might be a bad crank seal or case gasket, or just improper fuel/oil ratio or improper jetting. black smoke on the other hand is usually caused by too much gasoline burning, but if there were enough gas entering the engine to cause black smoke, the bike probably wouldnt run at all. but, if you can give me more info on the carb swap, and if possible any jetting information or jetting changes, thenI can definitely tell you what your problem is.
Posted on Sep 04, 2009
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Posted on Jan 02, 2017
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