Originally Posted by sseba2012

you've undoubtedly blown the gaskets, get a compresision checker unscrew the sparkplug screw in the compression checker and confirm the compression in the cylinder . Low compression causes loss of power at low rpms, and though it'll run better at high rpms it won't run well until the gaskets are replaced. When you added too much oil, the oil took up space usually occupied by air in the engine below the piston, as the piston went down the air was compressed to a much higher than normal psi rupturing the lower gasket (probably) and the upper gasket (almost definitely) as the fluid (oil) can't compress. The weakest part of the engine (the paper gaskets) blew out. Get the manufacturer's manual, carefully follow the instructions about torqueing the bolts when you reassemble the engine, and be happy that it was a cheap lesson in paying attention to following the owner's manual when adding oil to the engine
sorry nomadd, he said he drained the engine, and it's been several days, foam in the oil isn't likely. When he used starter fluid to help start the engine he was raising the engine compression by displacing the atmosphere that normally enters via the air filter...
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