1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 331Get this manual
ELECTRICAL Ignition Timing Adjustment Dynamic Ignition Timing, Cont12Point timing light at inspection holeBe sure to view the mark at 90 to the window to avoid misreadingNote the position of the scribed mark in relation to the pointer13If marks do not align, stop engine and reinstall dial indicator in Mag end cylinderRotate the engine until the mark is in the same position as sighted with the strobe lightRead dial indicator and compare reading to Degrees to Piston Chart on page 7.30
Ignition Timing Adjustment
To adjust ignition timing: 12Remove flywheel coverLoosen magnet holder screws