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What are the indications of a lean fuel mixture, and how does one correct it? - Top
- A lean fuel mixture is most often indicated by a hesitation during acceleration (in neutral or in forward). In more severe cases, the hesitation is sometimes accompanied by a "popping" sound from the intake throat of the carburetor; in more subtle cases, a lean condition may cause nothing more than a slight reduction in performance at high power settings.
If your engine has a late model (aluminum) carburetor, it will have a fixed main jet, and you won't be able to adjust the fuel mixture at cruising RPM. In this case, you will have to take the carburetor apart for cleaning - the problem is most likely a small restriction in the main jet.
If your engine has an early model carburetor, it will have an adjustable main jet with a small "T" handle extending out of the bottom of the carburetor at about a 45 degree angle. To make the engine run richer, you would turn the "T" handle counter-clockwise, as you would be facing the handle. The adjustment on the main jet is quite slow, so it may take at least half a turn before noticing any substantial difference. - Updated:
January 4, 2004
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