I rode my '03 4 speed in the desert all the time. I used to look for 5th gear a lot, but now that I have a 5 speed, I look for 6th, so.... Have him change the gearing to 49/15 or 48/15. He'll need to do a little more clutch work, but it will be better overall. He will be wanting a heavier flywheel, too. Get the 8 ounce from DRD.