You can waste alot of time and never get the proper mixture. There are only 2 ways to jet, one way is with the proper equipment to read the exhaust which the average person does not have. There are only 2 circuits in a carb, idle and main. The main will have absolutely nothing to do with the idle circuit and the idle circuit only has a small transition tie with the main circuit. The idle circuit should never be touched until the main circuit is properly jetted. To do it properly you will need a fairly level 900-1200' run and your plug wrench. You are going to start from a dead stop with engine warmed up then open throttle 100% and travel that 900'-1200' run, at the end of the run with throttle still 100% open you will kill the engine and you will only let off 100% throttle when engine stops. When engine stops you then let off 100% throttle and come to a stop. Pull the plug and read it, if lean increase main if rich reduce the main. Once the proper main jet is determined than you can determine the idle jet. The idle jet will only affect the idle and the slight transition from idle circuit to main circuit. Jetting any other way with the exception of an exhaust analyzer is a total waste of time. The idle circuit by theory always runs richer so including the idle and main circuits to read your plug will give you a false reading.
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