I have a 1989 yz250 and have a race coming up and I live at about 100ft above sea level the race im going to is at 5,500ft above sea level what should i jet my bike at?
Check your local dealer for set up for a race, the service department will have the speck's.......As for riding, you will have to figger that one out on yourself due to your Sea Level and What you run at your jetting ......It's a wide world out there, run what works for you.