2004 Polaris Freedom, Virage, Genesis and MSX-140 Service Manual., Page 273Get this manual
ELECTRICAL SYSTEMS Dynamic Ignition Timing AdjustmentCarbureted Models
CAUTION: When replacing CDI box on ANY domestic carbureted model, it is very important to check timingA new CDI box may be programmed slightly different than the one being replaced, causing ignition timing to be advanced or retarded too farNOTE: Always verify timing of engine at room temperature only (68 F20 C)Verify the ignition position at maximum advance (3000 RPM) when checking the timingIf engine damage has occurred due to suspected ignition related problem, check the ignition timing at the specified operating RPMAlways dial indicate the timing mark before attempting to adjust the ignition timingTo indicate the marks: 1Remove timing inspection plug from starter cover2Remove front (Mag) cylinder spark plug and install dial indicator3Rotate crankshaft by hand while observing dial indicatorAs the piston touches the indicator plunger, the dial will begin to rotateFind the exact point where the pointer stops rotating and reverses directionThis will be Top Dead Center (TDC)4While holding crankshaft with piston at TDC, zero indicator by rotating bezel until "O" on dial and pointer align5Rotate crankshaft opposite the direction of rotation about .200 BTDC (2 pointer revolutions)6Rotate the crankshaft in the normal direction of rotation to specifications outlined on pages 7.1 and 7.27Using fast drying white ink, mark the flywheel in line with the projection in the inspection hole to make it easier to see with strobe light8Verify proper piston position by repeating steps59Remove dial indicator and install spark plug10Connect tachometer according to manufacturers instructions11Connect timing light to the front (Mag) cylinderStart engine and increase RPM to 3000Dial Indicator