I am just about to pull my motor apart and put in some new hot cams and a 97mm piston in my 01 WR 426. I have a few reservations left that I want to clear up. When I tear the motor apart at TDC and then replace the cams, piston and new barrel, how do I know if the bike is at true TDC without the cams in the bike? Do I just have to make 100% certain that the entire time I have the motor apart the crank does not move at all? Do our bikes fire both on power and exhaust stroke?