If anyone could help that would be much appreciated. I have a 99 400ex. It makes a horrible sound when trying to start it up. Like a big knocking and grinding noise. I opened the case, but I couldn't get the flywheel off because I didn't have. A puller. But, from what I could see, there is a little rust inside the flywheel assembly. I ordered a new one way bearing and I'm hoping this will fix it. After it starts it runs like a champ. Can anyone help me out please