1980 Tecumseh 6 H.P. engine with a magneto , points and condenser ignition that sat 20 years did not run at all. There was no spark. Replaced the inop magneto coil, cleaned carb etc. and it runs. But it will not start using the stock pull start rope. But if turning it over with a drill motor it will start. Obviously it needs higher RPM's to start. But why? In other words, with the spark plug out and grounded, I find there is no spark if using the pull start rope, but there is spark when turning it over with the drill motor. I have removed the flywheel, cleaned the magnets , checked the gap to the specified .o12", set the point to the specified .020". Condenser obviously works, and the points are very clean (no pitting) indicating an OK condenser. But can condenser be "weak" and require higher than normal RPM's to start? Or ???