This picture shows where you measure the float height. ![]() Usually the float needs to be parallel with the float bowl mating surface when it is just barely closing the inlet valve. On my VM18 a change of 2mm float height required a half turn adjustment on the idle air screw. ![]() The height of the gas in the bowl is important to maintain stability when going over bumps and also has a slight effect on the jetting. The following is the right order for tuning:įLOAT HEIGHT- First make sure the bowl float turns off the gas inlet valve at the correct float height. This data comes from my jetting calculator. ![]() The graph below shows the range of effect of each of the adjustable parts of a carburetor. 2 Stroke Carburetor Tuning My Guide to Carburetor Tuning
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