THANKS TO ALL THAT RESPONDED,I WILL MODIFY THE CHOKE PLATE AS ADVISED AND ADD FUEL LINE TO THE NEEDELS AND I HAVE A 3W CARB MANIFOLD THAT I WILL INSTALL TO TRY AND CALM IT DOWN. ...... DOES ANYONE KNOW OF A LIGHTWEIGHT REPLACEMENT MUFFLER FOR THE 75 ? THE FACTORY WRAPAROUND IS HEAVYDUTY AND JUST HEAVY. MY KATANA IS DEFINETLY NOSE HEAVY AND AT 1200sq. in. AND 20 LBS. I DONT WANT TO ADD WEIGHT AND MY BATTERY PACKS ARE BEHIND THE TRAILING EDGE THERE ARE NO LOCAL HOBBY SHOPS IN MY AREA AND THE CLOSEST ONES WOULD NEVER HAVE ANYTHING LIKE THAT ANYWAY. IT WILL BE A WEEK AT LEAST UNTIL I TRY AGAIN ...LET YOU KNOW HOW IT TURNS OUT. THANKS, JIM