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How do they start the engine backwards? I understand how a two stroke can run backwards but how do they start it running backwards?
Run the starter backwards I guessAny DC motor will run backwards if you reverse the direction of the current in the armature.Of course the starters we are used to have a 1 way clutch.But the Bosch Dynastarter comes with just a double V pulleyNote it will also charge the battery while running backwards.http://www.dynamoregulatorconversions.com/dynastarter-kit-shop.php
A lot of marine engines have gear reduction, but no direction changing capabilities. They were shut down and reversed to make the boat go the other way. Also, a lot of early electric-starter vehicles did double-duty operating the dynamo backwards to start the engine. Modern slab sleds like the Goldwing also run their starter backwards to get reverse. That's why when I get challenged to a race by another trike owner my one condition is that we go backwards -- I have engine powered reverse and can go as fast that way as I go this way. It's the only way I can win. No, no takers on backwards racing so far.