The cam chain tensioner on my 2006 400 EXC has three clicks left so I thought I'd replace the cam chain. My question is what else should be replaced with the chain? I know the guide and tensioner should be replaced, but what about the drive gear? cam bearings and all the seals that go with it? Is there a kit available with all the necessary parts? One more thing...Im in the market for a chain tool, so if you have one available, I am interested. Thanks for your help.