I've got a strange one for you. I recently put a used motor into my 92 k75. Don't ask me how but I managed to lose a wrist pin on the original. I guess that's why it was only a few hundred bucks. I got a great deal on a used motor. Got it swapped out, and I am still under 1000$ on a pretty cool little bike.
Ever since I put the new motor in I am getting some strange behavior. Whenever the bike leans left I get about 500 more RPMs. Whether it's on the side stand, or if I am carving a turn. I am thinking it might be a worn out spring on the MAF. The enigne I bought came with one (and throttle bodies, and a good clutch and a bunch of other stuff for 150$!!!) so I just used that one. I am thinking of swapping it for the MAF off of my old engine.
Anybody got any other ideas?