2003 Polaris 3 PRO X Factory Service Manual, Page 271Get this manual
ELECTRICAL Conversion ChartDegrees to Piston PositionB.T.D.CIf the ignition timing specification is listed in degrees only, convert to either inches or mm BTDC and use dial indicator to verify timing marksNOTE: Due to differing rod lengths and engine strokes, consult the engine model list for correct engine