DT40 trim motor...i think?

[seanfishy]

It was the loose bolt on the flywheel cover. I have no idea why or how that happened but its fixed and running again.

Fired right up after that bolt was tightened and made a connection again.

[Solarman]

dt40

Well, not sure how that is happening, but sounds like you should check over your bolts & nuts on the motor before they vibrate off, and get lost.
Good luck.