2001 Polaris SLH, Virage PWC Factory Service Manual, Page 231Get this manual
Electrical Systems Dynamic Ignition Timing AdjustmentAll Domestic Carbureted Models
WARNING
When replacing COl box on ANY domestic carbureted model, it is very important to check timingA new COl 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 G)
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 cover23Remove front (Mag) cylinder spark plug and install dial indicatorRotate 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 (TOG) While holding crankshaft with piston at TOC, zero indicator by rotating bezel until "0" on dial and pointer alignRotate crankshaft opposite the direction of rotation about .2001 BTOC (2 pointer revolutions) Rotate the crankshaft in the normal direction of rotation to .081 1 (2.06mm) BTOCUSing fast drying white ink, mark the flywheel in line with the projection in the inspection hole to make it easier to see with strobe lightRemove dial indicator and install spark plugaccording too