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Message: [QUOTE="okkarner, post: 1402852, member: 120826"] Did some tuning/testing today. 1st I repacked the muffler because the packing was soaked and moist. I did a spark plug check and it was black and wet so I set the needle to the leanest (top) setting and adjusted the air mixture scew to the highest idle (3.5 turns out) and it revex a little higher. The air filter is a cheapo cone filter off eBay I think. I took it off and the bike was a whole different machine. Not quite right though. By taking the air filter off I leaned the mixture. Right? So I'm thinking time for a smaller main jet. It has a 350 right now. With the filter on it won't rev up no matter what the mixture screw is set at. [/QUOTE]