Hi i have a 01 yz426 that i cannot get to fire with the kick start. I can move the kick start lever about halfway down but then stops. I however can turn it over by the flywheel. I recently had the top end apart to replace the base gasket and i replaced the head with a 00 426 head with SS valves. After i did this i put everything back together and the bike ran awesome, but was leaking a little around the base gasket. So i removed my valve cover and cams and found out the cylinder studs were loose I tightened them up and assembled everything no different than the first time expecting it to fire right up and this is where i'm at. The bike ran fine before this. I'm stumped now, the timing is set correctly i believe (according to the manual) i just don't know why it wont turn over with the kick start lever? I have not tried bump starting it because i don't wanna mess anything up if somethings not right. Any ideas?