In Reply to: Starting a rebuilt engine posted by Chris Libby on April 16, 2020 at 22:22:37:
wow! Your seriel number is 30 older than mine. I have 9N 8047. The engine is out and waiting for me. I have smooth hubs, 32" tires and double rib fenders and a hood with a snap in door to install on it.
To jump you tractor from a negative ground 12v system: ground your 12v system ground onto the tractor NOT ON THE BATTERY. Take your 12v HOT (positive) and "touch" it to the starter post, do NOT clamp it on. This way, you are only providing 12v to the starter. The starter can handle 12 volts, your 6 volt ignition system cannot.
If you are trying to start the tractor with this method, turn on the iginition and set the throttle and choke (if needed). DO NOT push the starter button.
As mentioned, if this does not roll the engine fast, check for ground contact between the starter and the engine block.
IF the ground is good and with plugs are out to roll it over, it sounds like something is too tight in the rebuild.