I would start with the sliders and the spring in the rear pulley first and make changes one at a time if you can and keep a log book of results with the mods. I agree with the muffler due to noise, because louder isn't always faster. I only opened up my muffler tip by a 1/8 of a inch. Went from 5/8 tip to a 3/4 tip and it sounds a bit deeper. I first tried a 1 inch hole in my muffler and it was loud and ran poorly due to me not jetting it up.
Last edited by Johnny 5; 05-10-2013 at 09:44 AM.
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