Help just got a 2003 xr400, the guy had it set for road work FS 14t rear 37t Wow fast on the roads but the throttle response/travel is way to fast, 0 to full in about 1/8th turn or from 12 O'clock to 2. This is like a mx setup, no name or markings on it. Please can someone let me know what the stock option is and is there a slow version i.e half a turn. I am setting things back to a more usable gearing but need to sort the killer throttle. Also the thing seems to almost have a turbo, it surges forward after about 2000rpm is this normal? any help appreciated.