Really old Green Machine chain saws were made by Zenoah, became the G38(model 7400) and G62(model 7700)..Still have one of the 62s here to convert..The cylinder is the same but the crank is smaller diameter on the flywheel side with the taper..makes a G62 that weighs under 4 lbs....
Current Red Max saws are the same, with different model numbers...
The crank and cylinders from the Echo twin chainsaw are still being used in the D&B and BME twins..The now discontinued Spehar twin also used these parts...