I have finished machining my Thompson single cylinder engine (sort of). There are a couple of tube videos of this engine running. They both show the engine running in a counterclockwise direction (viewed from the flywheel side). I set my engine up the same way and got it to run a few seconds before the bolt holding the connecting rod to the crank unscrewed itself. I put the bolt back in and tightened it. Ran the engine and a few seconds later, the crank bolt unscrewed itself again. I looked at the cam gear and it looks symmetrical to me, so I am thinking reversing the rotation would be fairly simple (correct?). I am thinking that reversing the direction would result in the crank bolt being tightened rather than loosened. My other option would be to loctite the bolt in place. Thoughts?
On another matter, I would like to share my valve lapping dodge. Don't laugh, it worked for me. Valve lapping is mostly reciprocal rotary motion, correct. I had an old electric toothbrush and I thought why not? I put the valves in the head, applied a bit of TimeSaver lapping compound, coupled the valve to the toothbrush using bit of plastic tubing for a flexible connection and after a few seconds, My valves were lapped! Sealed perfectly. Rick