Today I was riding my 1992 FZR600r and I was on the highway for approximately 45 minutes straight. When I slowed down to stop my motor started making a banging sound that was rhythmical to engine RPM's. It was rather loud but after I pulled over and let the bike cool off if it was much quieter. I had to ride it home and the banging sound became much quieter with time and now I can only hear it when accelerating and it's very faint. I've accepting the fact that this is not an easy or inexpensive fix but I'm not sure exactly what it is. I'm also concerned that there may not be parts for this bike available. Does anyone here have any suggestions on where to start looking for the problem or if parts are available and if so where can I get them. I already (unfortunately) put a lot of money into this bike and now I feel like I should just write this off as a total loss. Any input is appreciated. Thank you.

After I got it home everything seemed fine with it. It still makes that noise, but only when the engine is under load. As much as I don't want it to be a bearing (which it probably is) is it possible that it could be the water pump or alternator? The sound sounded like it was coming from the alternator. After I got it home everything seemed fine with it. It still makes that noise, but only when the engine is under load. As much as I don't want it to be a bearing (which it probably is) is it possible that it could be the water pump or alternator? The sound sounded like it was coming from the alternator.

Update: I determined that the problem is the magneto. I took the cover off and it appears that the metal ring is rubbing against the coils which explains the horrible noises I have been hearing. The engine turns fine as well. My next question is is a failed magneto a sign of a more severe problem? Thank you. Update: I determined that the problem is the magneto. I took the cover off and it appears that the metal ring is rubbing against the coils which explains the horrible noises I have been hearing. The engine turns fine as well. My next question is is a failed magneto a sign of a more severe problem? Thank you.