The Stovebolt Site Forums The Shop Area The Electrical Bay Stomp starter puzzlement

As Kevin says.

Need both. Both start the motor. As the starter cranks and draws amps, the voltage necessary to push the amps goes down becasue of voltage drop inside battery as it heats up. Heat equals resistance. Other voltage drops/resistance in play also. Then not enough volts to push amps to start motors with some kind of problem.

To start a good running motor with proper cables (and good foot start contacts), In a pinch, a starter needs 300 min amps at 10V min. Carb motor, non electric fuel pump. The points can run on 8.5V-9V.
But still waiting for symptom explanation from poster.