you dont need to do anything to the carb if you just plan on using a custom header with RLV muffler. if you add an aftermarket air filter to the intake side you should increase your main jet size and your idle jet size. figure out how to read your spark plug and that will tell you how lean or...
i strongly advise against trying to reset the governor unless you forced that arm that goes under the fuel tank one way or another. there has to be something else blocking your throttle shaft from going back to idle and creating the gap. it should look like the throttle shaft in my picture.
i think i know what your problem is. that lever that rests on the adjustment screw is called a throttle shaft. you said you took the carb off and that was it. did you mess with the arm on the top of the engine that is bolted to the governor? if not, then your governor is fine and its not the...
maybe 1 or 2 mph. the engine will only go as fast as the governor will let it. once you hit the limit the governor kicks in and reduces rpm. your speed is all relative to your gear ratio and your tire size. have you considered buying one thats already race ready? they are not that much more...
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