1994-2001 Yamaha Venture/V-Max 500 Series Snowmobile Service Manual, Page 394Get this manual

1994-2001 Yamaha Venture/V-Max 500 Series Snowmobile Service Manual, Page 394

CARBURETOR TUNING IANOSJP (0) Main jet selection chart Spark plug color Light tan or grayDry black or fluffy depositsWhite
too richMixture is too leanReplace the main jet with the next smaller sizeReplace the main jet with the next larger sizeReplace
the piston and spark plugTune the carburetor againBegin with low-speed tuningCheck the piston for holes or seizureCheck the
cooling system, gasoline octane rating and ignition timingAfter replacing the spark plug with colder type, tune the carburetor