2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 110Get this manual
ENGINE 2Apply starter drive grease to the drive bushing in the crankcase and all moving surfaces of the starter drive mechanismInstall the starter driveApply Starter Drive Grease to Bushing 9Place new rocker cover gasket on the cylinder head and install the cover and boltsRocker Cover Bolt Torque: ftlbs(8 Nm)
Thermostat Installation
Install the thermostat with one of the air bleed holes positioned next to the upper thermostat cover bolt hole as shown
3Install recoil housing gasket and recoil housingStarter Drive Grease: (PN 2871460)
Rocker ShaftRocker Arm Assembly Installation