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Old 06-30-2010, 11:25 PM
nidyanazo nidyanazo is offline
Join Date: May 2010
Location: SoCal
Posts: 316
Default Re: Muffler discoloration

The change in color is normal.
To see if it's running rich, do a plug chop.
That's where you run the bike at full throttle (or part throttle, whatever rpm range you want to check) and then kill the motor.
Pull the plug and check if it's dark and wet (rich), white and burnt (lean), or just right with a nice brown tint/

Last edited by nidyanazo; 07-01-2010 at 04:03 AM.
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