I would keep an eye on the frame work and suspension for cracks on these machines.I believe there is an id tag somewhere on the frame of the machine with the valve settings if not try Baja customer service at 1-888-863-2252 or try herehttp://www.bajamotorsports.net/Downloads/ATV/BA90%20-%2090cc%20ATV%20Owners%20Manual%20(VIN%20prefix%20L5DS).pdf