The first step in carb tuning is taking note of all the current settings: fuel screw setting, float level, pilot jet, main jet, needle jet, clip position, and possibly more depending on the carb. This way, if tuning makes it worse, you can at least get it back to where it was. The main jet controls the the top end, so you are right in thinking you shouldn't change it(for now). After documenting the current settings, the first thing I would do is adjust the fuel screw for the optimum idle. This setting will tell you what direction you need to go with your pilot jet.
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