Forum Help, Questions and Info 2009 rzr 800 April 27, 2015 I have to overhaul the top end of my RZR cuz it’s smoking now, what I’d like to know is, if I go with a big bore kit, will it add a lot of power? Will it stress out the lower end? Or should I just go with the original? Thanks Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related