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Got the piston fitted. I see the pin for rotary valve. Should the slot in valve be pointed to the pin or away from it?

Contra piston also very very tight if it is forced into recess screw will not move it

Piston is so tight engine can not be turned past tdc. I think I will hone cylinder just a bit. I don't understand the rotary valve. If it does not turn with the crank how does it function? Bob

Engines are about the same size but obviously quite different. I have some questions or problem with the Russian engine. 1. The piston is very tight in fact won't pass completely through the cylinder. It feels like the cylinder was made with a very slow taper so the piston starts but tightens as...

how tight should the contra piston be?

Anybody have the "formula" ? Diesel plus ether?? Bob