....earlier in this thread the O.S. .15 diesel was listed a having a piston baffle and adjustable compresion. I had one late 1950's into the 1960's. Never had a problem with this engine. Was a great combo with the original size Flite Streak...
Thanks Jack. I saw where there was reference to the OS earlier. Before this thread I was unaware any had ever been made. Out of curiosity, do you remember how OS kept the contra-piston from rotating?
Bill