gasguzzler
Seaman Apprentice
- Joined
- Aug 3, 2004
- Messages
- 41
1984 MERCURY SERIAL#6449738 2STROKE MODEL#50 50HP 4CYL 2CARB #WMA1-3/UP #WMA1-1/LOW ..As I understand it "max. spark advance"is 33 degrease before top dead center. With my Craftsman,automotive type,timing light pointed at the "FIXED POINT INDICATOR" and the "EDGE OF THE FLYWHEEL",With the throttle moved forward,until the "max spark arm adjustment screw is contacting its stop, It should show a reading of 33 degrease. Also at this point, contact with the carbrators is made.Continued forward movement of the throttle now opens the carbrators and "max timing advance" now stays fixed at 33 degrease.