Join Date: Mar 2014
Location: Lowell area, MA
If the piston isn't moving, that, to me, means one of two things:
- The connecting rod from the crankshaft to the piston is broken, so the connecting rod can't move the piston up/down.
- The pull starter is not actually turning the flywheel and crankshaft.
Is the pull starter definitely turning the crankshaft? One way to confirm that would be to tie down the auger or transmission handle (with the transmission in maybe a high gear). Remove the spark plug wire, and pull the cord repeatedly. You should see the impeller turn, or the machine should start to roll, depending on which handle you have squeezed. Or remove the belt cover, and watch the pulley on the engine when pulling the cord.
If the pull starter is turning the crankshaft, but the piston isn't moving, then that sounds to me like a broken connecting rod. Assuming that the spark plug hole is directly over the piston, which it typically is for a flathead engine.
A pull starter issue is probably a fairly straightforward fix. A broken connecting rod, on the other hand, would be quite a bit more involved.
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