Re: Spark advance or Spark retard
Make sure the timing is correct and the points and condensor are in good shape first. Then make sure it isn't starving for fuel. But an engine with a mechanical advance needs a certain amount at a given strain and RPM. You'll need to move the lever until it sounds just right. So there is no magic spot, each engine is different. Downshifting also helps with the leverage aspect of it and uses the torque properly albeit slower speeds. Too much advance and detonation, too little and the engine will overheat.
A's have the best with the mechanical levers it lets you set it where it wants to be.
Have fun,
Tim
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