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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,267
If it is way to lean accelerating above idle then a motor will usually stall or die out in a smooth all at once way with no bucking or misfiring and with no smelly hydrocarbon black exhaust smoke when you open the throttle, and if it's way too rich they usually misfire and chug and buck while trying to accelerate with alot of overly rich fuel smelling black or dark grey smoke coming out the exhaust.

Used spark plugs will be black, sooty, and possibly wet with fuel if it's way too rich and they will be clean and very light colored and the insulator will be almost white if it's too lean.
Old 07-21-2011, 08:28 AM
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