1972 Evinrude StarFlire 125 HP Outboards Service Manual, PN 4822, Page 44Get this manual
Figure 4-25Wide Open Throttle Adjustments
Figure 4-23Motor Running at 50 Advance Timing
Figure 4-24Throttle Cam Adjustment
Check crankshaft and flywheel tapers for any traces of oilThis assembly must be perfectly drySwab tapered surfaces with solvent and blow dry with compressed airInspect both tapers for burrs and nicksInstall flywheel and tighten nut to torque specified in Section 2
SYNCHRONIZING CARBURETOR AND DISTRIBUTOR LINKAGE
Adjust throttle cam as described on page 3-11, Section 3Connect timing light to No1 cylinderstart motor and adjust idle speed adjustment screw to advance timingSee Figures 4-23 and 4-25Astop motor and ajust throttle cam yoke to align upper embossed mark on throttle cam with center of throttle cam rollerSee Figure 4-24Open throttle to wide, open position (upper carburetor throttle shaft roll pin against its stop)See Figure 4-25Adjust full throttle adjustment screw to prevent strain on throttle shaftSee Figure 4-25ANOTE: strip of thin (.003") paper between the roll pin and stop should pull out with just slight dragWith timing light still connected, start motor and check timing as described on page 4-7, Step 9NOTE: If major power head component has been replaced, or timing pointer disturbed, check timing pointer alignmentSee "Timing Pointer Adjustment," page 4-14