hi i have ajusting the valve clearance on my bike (prairie 700 2006) the problem is i can't fix the clearance like the bike book tell me to fix it is suppose to be .010 for intake and .020 for exaust whit this clearance the valve snap, i have fix at .006 for intake and .010 for exaust and the bike run verry good like that, the tf and tr mark was in good position when i have made it if some one can tell me why i have to reduce the clearance to have no valve snap thanks