I just recently bought a 98 ZX7R and have noticed that the bike, if left alone has a tendency to drift to the right. I first noticed it when I tried riding the bike with no steering inputs (hands off of handle bars) and it instantly started to drift to the right. Once I put my hands back on the handle bars, I noticed that for my bike to go straight, my bike had to be ever so lightly tilted to the right; if I tried keeping the bike visually leveled, that made the bike go left and it felt awkward. I just recently talked to the original owner and he just revealed to me that he noticed that as well. I should have noticed this prior to my purchase, but hindsight is always 20/20. I know, when I let go of the handle bars on my F4, I can go some distance without requiring steering input from the handle bars. The rear wheel shows that the bike is not riding along the center line. I've heard of a possibility that this could be caused by an uneven wear on the tires, but this seems doubtful. I'm no mechanic, but I suspect alignment? I'd appreciate your thoughts. Also, what would the repair costs be? BTW, the bike when idle, sounds like a diesel engine; is this normal? Is this a Kawa characteristic and/or a 750 CC? My only reference is the F4.