degree wheel mounted on crankshaft and piston set at top dead center using a degree wheel and dial indicator(not shown). rotating the crankshaft c/w and then ccw to find the center and then setting degree wheel to that point. with the head on a piston stop will be used to set degree wheel at true top dead center. this engine is equipped with a automatic advance unit (aau) and will need blocked to full advance position. the magneto drive gear itself is loose on the shaft at this time and will be locked down once magneto is set to proper position (37degree) with points just opening. rotating the crankshaft backwards past the point of timing and then forward to 37 degree(to remove gear lash).
.001 plastic installed to check when points separate. magneto set into position and then gear locked down on shaft. recheck timing to confirm.