What is your needle setting and what is your head clearance? The good starting point is try 1.0mm on LSN and 0mm (flush) for the HSN. Mine now is 1.3 and 0.3 and running very good with low temperature. What fuel are you using? Try Novarossi or JP Turbo pipe. Kawahara ZAC pipe will produce the best power from my experience but with lower fuel mileage.