Hey guy. Newbie here building a little drag bike with a predator 6.5 212cc. I milled the head .050 and add 18lbs springs and bored out the carb. I'm trying to set the lash on the valve and I read every post here and most people say .003 for exhust and .002 for intake. But after I set it and spin the motor back to top dead center they are wicked loose and fall off so I set it again and spin it and it does it every time. Are there any tips that would help me out?