The point of this engine guard should be to protect stock parts of your Yamaha if it should be dropped. In that regard it seems perfectly adequte and fits well and matches the look of the bike. However the instructions suggest that you file down the sprocket case so one of the bolts on the left side will fit. All Yamaha had to do was choose a different mounting place on the left side of the engine (there are at least 5 other places that would work just fine if they were smart about it), instead this guard requires you to permantly modify your sprocket case to make it fit. I want to protect the stock parts on my bike, not deform them. With that said, I was abe to make it fit by leaving the screws on the srocket guard a little loose and now it works great. At first I tried to force fit it with the sprocket screws still tight, but the sprocket guard wound up rubbing on my chain and made a horrible noise (like you would expect from metal rubbing on plastic).