It seems I somehow lost my spark plug, so not sure. Guess I'll order a new one - would this be the correct plug?
New piston arrived and it's 49mm as advertised. Wrist pin distance seems good. As you can see in this pic though the piston in its entirety is longer than the original (47mm), is that going to be an issue?
Going to remove the flywheel for the first time now in order to replace the points, wish me luck!