Re: timing a 115 mercury
Disconnect the white/black leads on top of the switchbox terminal,if it has an idle stabilizer.<br /><br />Remove all the plugs but number one.Disconnect fuel line.<br />Remove the throttle cable barrel from it's retainer on the cable anchor bracket.<br />Loosen idle stop screw locknut and turn screw until throttle cam mark align with crankcase braket arrow.<br />Tighten locknut.<br />Loosen carberator lever screw.<br />Holding idle stop screw against stop, move carberator lever until the shutters are completely closed.<br />The roller should just contact the throttle cam.<br />Connect the timing light.<br />Place engine in NEUTRAL and position throttle lever with idle stop screw against it's stop. <br />Point timing light at the flywheel, crank the engine, and adjust primary pickup screw to set the primary pickup point.<br /><br />Loosen the maximum spark advance screw locknut and position the throttle lever with the screw against it's stop.<br />Pointing the light at the flywheel, crank the engine, and adjust screw until timing pointer aligns with the 20* mark on the flywheel's timing decal.Tighten locknut..<br /><br />Rotate throttle to wide open position. Adjust throttle stop screw to permit full carberater opening without allowing carberator shutters to act as a stop.<br />There should be .010-.015" clearance between the carberator lever roller and the throttle cam.<br />Re-install plugs.<br />Reconnnect white/black leads to the switchbox harness.<br />And so it is written.<br />Good luck.
