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[QUOTE="Boit, post: 97656, member: 19734"]
It's somewhat normal to require a slightly leaner main jet during the summer. Why? Because warm/hot air is less dense than cool/cold air. If youare using the #180 main during the winter and the engine runs fine...as the ambient temperature rises, it's normal that the engine becomes sluggish at sudden throttle changes and blubbers on the top RPM range because the engine is now running slightly rich due to less available air. To compensate, usually a slightly leaner main jet will cure the problem. Try a #178...and test for wide open throttle runs. If it still blubbers a bit...go to the #175. The goal is to get the engine to run the best with the richest possible main jet. What I have found is that once I get to the correct jet, the engine really comes alive. Also, I use VP C-12 fuel. This fuel typically runs on the rich side so compensation is in order. Oygenated fuels are the opposite. Since main jets are very easy to change, experimentation should not be a problem.
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