Do a search on throttle stop - there are many posts on the subject (including 2001). Cutting measurements reported vary - trim to get 100% opening (13-15mm if I remember correctly). Yes a YZ stop is a perfect option. Got one in my bike plus a spare or two (I have trouble waiting). YZ PN 5JG-14591-00-00 Adjustments - just show a little more caution when you nail the throttle .