RZR 900 Engine How many hours on your bottom end? September 28, 2015 I am having a buddy replace my top end with a big bore, but want to know how many hours are people seeing on their bottom end? Its a lot more work to get down there and inspect, so I want to know if its worth it on a motor with 118 hours. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related