I was torqueing the magneto cover bolts to the specs in the shop manual and they never got tight. I looked at the bolts and they had craked the cover at each bolt hole. Now I know that you can't torque bolts on a plastic cover to 78 inch pounds like the manual calls for. Has anyone else made this stupid mistake? Can you buy a non plastic replacement cover for a reasonable price? And if I need to buy another plastic cover how tight to you need to make these bolts? Thanks