I have a 2002 750 and I am having a problem of it only wanting to run on one cylinder. I checked all the spark plugs and wires they are all firing. The compression is also good on both cylinders. We have two of these bikes and when I take any of the spark plug wires loose on my dads bike the bike begins to run rough and if I take off two from the same cylinder it will still run but really rough. On my bike if I take off either of the back spark plugs the engine note does not change. I can even take off both plugs from the rear and it will still go unchanged. If I take off either of the front two the engine bogs down and almost shuts off. So the only thing I was thinking was that it could be the carb on the rear cylinder acting up. The part that amazes me is that the bike will still launch hard like it is running on both cylinders but I can take the wires off the rear and it will still run the same even going down the road. When I look at the spark plugs on the rear they have a yellowish tent to the tip of the spark plug while the ones on the front look normal and are white.