I have a 2002 spirit 750. It Runs like a champ, but sounds like its redlining at 55mph. (I dont have tachometer, so I cant be sure) I can get up to about 65, but not for very long, it just sounds like it revving way too hard. I used to have a little 100cc enduro that would do about 50 mph, so I find it hard to believe the top speed for a 750 is 60mph. Could this be a jetting issue. The pipes have been changed, they're not the stock pipes, I thought he said he put a new jet kit in it also. Could it be the wrong size jets? Any thoughts or Ideas would be greatly appreciated.