This is a beautifull manual cam chain tensioner for any year Polaris RZR XP 900/1000.
Your stock tensioner is hydraulic and is prone to failure. When these fail your valves skip time and that will put an immediate halt to your ride or race. Also the factory tensioner has a small hole in the top of it that can drain the oil from the tensioner if the RZR is flipped over. We have seen many engine failures due to roll over and loss of prime in the tensioner.