2001 Polaris SLH, Virage PWC Factory Service Manual, Page 234Get this manual
Electrical Systems Ignition Timing AdjustmentIgnition Point Adjustment UnitContinued
8Connect timing to light to MAG high tension wireStart engine and verify timing with timing lightCAUTION:
Never operate the engine for more than 15 seconds while the watercraft is out of the waterOverheating of engine and drive line components will resultTiming can now be set to exact specification using the Ignition Point Adjustment UnitPress the "POS" or "NEG" button to advance or retard timing until timing is at specification Pressing the "POS" or "NEG" buttons will advance or retard the timing in one degree increments up to two degrees each way