2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 83Get this manual
ENGINE 3Apply Polaris Low Temp Grease (PN 2870577), or engine assembly lubricant to the camshaft main journals and cam lobesLubricate automatic compression release mechanism with clean engine oil(To install the compression release mechanism, refer to Page 3.14)Plate link aligned wdot
Camshaft InstallationTiming Method Refer to Page 3.40
1Apply Polaris Low Temp Grease (PN 2870577), or molybdenum disulfide grease to the camshaft main journals and cam lobesLubricate automatic compression release mechanism with clean engine oil(To install the compression release mechanism, refer to Page 3.18)2Install the camshaft with the lobes facing downward and the sprocket alignment pin facing toward intake3Disconnect the wire from the cam chain and rotate the engine to align the single (TDCtiming mark (Top Dead Center) on the flywheel with the notch in the timing inspection windowBe sure to use the single TDC mark when installing the camDo not use the advance marks4Loop the cam chain onto the cam sprocket with the dot on the sprocket facing outward and the alignment marks parallel with gasket surface5Before positioning the sprocket on the camshaft, check the position of the cam sprocket alignment pinWhen the cam is positioned properly, the cam sprocket alignment pin is facing to the intake side6Install the sprocket on the camshaftApply Loctitet 242 (PN 2871949) to the cam sprocket bolt and torque to specifications