you have to run k-pro, you don't have an option and the crank will be fine
The reflash has been out for a while, if the motors can't handle it then they would have changed it by now, but for what it's worth I wouldn't waste your money. You're not going to notice much gain and its a big chunk of change for another 500 rpm's.ok then maybe just keep it stock put some bolt on on it. So will my stock head beable to handle the rev limit raised up to 7,700.