RE: Enya 40 ss, leaning of when vertical
Actually I believe this engine uses a cast iron piston so please DON'T use the instructions in the link above. It sounds like the new piston/liner hasn't been run in and it's overheating badly causing the sagging then some cooling off as it comes back down and unloads the prop. To check if it's cast iron, cut a small strip from one of those flexible fridge magnets and put it on top of the piston through the exhaust port. If it sticks, it's iron. If it's iron it needs a lot of tender running in (hopefully it's not too late).