What does specific gravity have to do with the tune/jet/heat range of spark plugs?
I look at that as the way to measure how thick the gasoline molicules (SP?)are, the higher S.G. the closer the molicules are to each other(thicker
) so I have needed to lean the fuel mixture to get the spark plugs and time slips the best I can get them, 100 L.L. aviation fuel with .690 S.G. I bought and used needed bigger jets than on race gas to get close to what I liked to see on race gas with .740 S.G.
Always jet up until the 1/4 MPH slows down, no matter what type of gas
