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Exhaust can be .030″ lower than legal, cut the skirt for max intake and set the head clearance for .025″ with 15 degree angle and a 1/64″ radius. Advance the ignition to max legal.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience