RZR 800 Specific Discussion 2012 rzr. 800s. Help…. November 29, 2015 My 2012 800s is all stock. Sometimes it will just shut off and not start.. Then it will start with no problems. I’ve checked the fuel pressure and it seems fine. When it starts it runs great. Any help would be greatly appreciated Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related