2003 Polaris Scrambler 50-90 Sportsman 90 Predator 90 Service Manual, Page 49Get this manual
ENGINE 16Make sure cylinder surfaces are clean and free from debrisInstall the cylinder gasket, cylinder, cylinder head gasket, and cylinder headTorque the cylinder head nuts to specification19Install the fanTorque the fan bolts to specification
Fan Bolt Torque: 84 in.lbs(9.5 Nm) Cylinder Head Nut Torque: 14 ft.lbs(19 Nm) 17Install new spark plugThe spark plug gap should be .024.028" (.6.7 mm)Starter Wheel Installation 18Install the washer and needle bearingCarefully install the starter wheel onto the crankshaft20Install new crankcase cover gasket, grommets, and crankcase breather tubeInstall the air filter and the crankcase coverTorque the crankcase bolts to specifications