Uncategorized 12 850 pinion cover necessary??? February 16, 2017 dstech Just got a 12 850 ho and have been reading about the pinion cover deal. I plan on keeping it pretty much stock maybe someday some different 26" tires. Is it necessary to replace that cover? How many stock ATVs have broke them? Thanks for any advice Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related