I have 372cc banshee with fatty pipes and power core 2 silencers,im running k&n air filter with lid,+4 degrees cdi box,280 main jets.
With this set up (according to trail tech) at 20 degeees celsius i can get around 11 100 - 11 200 rpm and at 35 degrees around 10 700 - 10 800 (at sea level).
If i shave head for 0.30 mm i suppose i would get over 12 000 rpm and im wondering is crank welding necessery?