Im changing my chain and sprockets, and also buying a TM Kit for my bike. Along with some radiator guards, skid plate, just some other goodies. While Im doing all that I got a couple questions. 1. How to take front sprocket off, I notice Yamaha has a washer type thing "bent" over the nut, do I just bend it back, and take it off? Would using a Impact wrench be better for this job? We just bought all new air-tools and I wouldn't mind putting them to good use! Is there any tips or things to look out for when changing sprockets and putting on a chain? Im not going to be cutting the chain, Im using stock 13/49 gearing, with a 114 link chain. Also, I didn't fully strip the heads on my case saver/plastic guard screws, but that soft aluminum phillips head screws are getting bad, what size screws are they, so I can head down to local hardware store and pick up a couple more, hopefully allen heads if I can find them. I want to still use the cover, I know some of you guys take the cover off and just use the case saver (smaller screws), but I like to have it all on...covers obivously there for a reason, and it don't hurt anything so I don't mind it. Thanks AGIAN.