WOW! I got 5 years before a rebuild and now I bust a set of pins monthly. I have a 14 year old IR 212 that I use as a back up that has never given anyMY IM31 is 25 years old and gets the WHEEEEEEEEE used out of it. Never been back for a rebuild. Includes 17 years in a CAR dealership, where 10 times the use as a bike shop is the norm.