I was adjusting the values on my YZ400. Before I took that cams out to get two shims I marked the chain and cam sprockets. The marks got rubbed out and now I can't find TDC because the previous owner installed a moose flywheel weight. It is blocking the window in the crankcase hole. Do these weights replace the stock flywheel or is the stock flywheel just behind this Moose weight. If it isn't is there any other way I can find TDC again? Thanks for any help.