Tech Tips: Repairing and Servicing Fuji 400, 450, 500 and 550cc Engines

Many of the engines that power Polaris ATVs are liquid-cooled, single-cylinder, SOHC 4-stroke units manufactured by Fuji. The 400, 450 and 500cc engines are nearly identical outside of bore and stroke. The newer 550 engine is updated, but some of these tips still apply. The 570 engine has a DOHC head and is unrelated for