One other thing I noticed is that the crank/flywheel assembly is not balanced. I will try to balance it, at least statically, by drilling some holes in the side of the flywheels, similar to what is done in full scale engines. This should smooth it out, at least the up and down motion.
Also will try to get the power of the hits higher with more dialing in and running time.
The guy from the first video reported more power after he hand lapped the valves in, if you go to his channel there is a how to video on this exact engine. His method is quite simple and easy thing to do. I believe he used "whitening formula" toothpaste for lapping compound, there is a mild abrasive in this kind of toothpaste and cleans up well with warm water.
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