First of all great bike, and at 150lbs it was a tough choice, 250f again or 450f. I defenatley made the right decision, the torque says it all. I am uncorking to taste and so far have the exhaust tip opened up and the throttle stop cut, this is plenty for now. The exhaust is still on the quiet side from what I am use to but I kinda like it. So with that the motor sounds noisier, normal valve noise but when the clutch lever is pulled in it sounds quieter (mostly noticed in nutural) I have heard this in other bikes but it just seams more noticeable. Anyone noticing this? One other thing I have heard about is the gas vent hose leaking, I have that and I think it is because of all the heat from the radiators and the exhaust cooking the gas. It leaks down the head tube and black stuff runs onto the fender. I tried one of the shorty tubes with the check valve but it didn't help, sometimes pressurized the tank and sometimes leaked. Any Ideas here also?