Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: carb problems
Lowering the float will lean the mixture through the entire range and every operating mode. Normally carbs are tuned to run pretty close to the lean limit on the mid range, which is where it should be cruising on the highway. If it gets too lean from that point it can lead to burned valves, detonation, and holes in the piston crowns.
What you should do is drop the level just a little at a time - 1/32" maybe, no more than 1/16". Then run it at low engine speed with full throttle. If it knocks you've gone too far. Then run it on the highway for a while and read the plugs. If they turn white, insulators glaze, electrodes round off, you've gone WAY too far, and are flirting with disaster.