2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 84Get this manual
ENGINE (300) 6Install case screws and torque in cross pattern to specification3Install the tensioner blade and tighten the mounting bolt to specified torque
Crankcase Bolt Torque: 6.5-8.0 ftlbs(9-11 Nm)
Tensioner Blade Mounting Bolt Torque: 5-6.5 ftlbs(7-9 Nm) 45Install new O-ring on the stator plateLubricate the stator plate seal and bushing with engine oil and install the stator plate
Cam Chain, Oil Pump,Tensioner Blade Installation
12Install the cam chain over the drive sprocketLubricate and install the oil pump geroters, aligning the marks made during disassemblyClean the marks off the geroters