Yesterday, I installed my Tanaka PureFire (PF 330) on my new TREK comfort bike (21 speed). I bought the whole motor set up from Golden Eagle Bike Engines on the internet. They are in E. Lansing Michigan. Wow! This is a very good set up. I'm very happy with the engine and the golden eagle system (they recommended and sold this motor to me). Are there any things I can do to improve the performance of the motor. I saw the High Performance carburator and muffler kit that Tanaka sells for this motor. But, the people at Golden Eagle told me not to put this kit on until I had at least 2-3 thousand miles on the engine. When I asked why wait so long, they said that if I don't wait until the motor is well "broken in", I will have to frequently adjust the jets on the after-market high performance carb. They said if I wait, as per their recommendation, until the motor is properly broken in, then I will probably not have to adjust the carb. very often. So, are there things I can do to get higher perfomance? I love this little motor! Thanks.