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The engine runs a lot hotter than a four stroke engine, you should only use oil that is made specifically for a two stroke motor other wise you run the risk of catastrophic failure.

assuming that you have already done that then the other reason is that in the process of firing and compressing the pistons, there is a stroke that can be referred to as a dirty stroke ( that is why a two stroke has such a gassy smelling exhaust) this stroke is one that lines the walls of the cylinder with a thin film of lubricant (oil / gas mix) to make way for the next stroke, the combustion stroke. Now after the engine has warmed up enough the gas portion of lubricant vaporizes and is ignited and helps with compression of the other piston(s). so that process burns the oil and in turn will make the oil per to say turn black.

Two stroke engines should be taken apart and cleaned pretty regularly and proper jets should always be adjusted or replaced under hard use, they do wear out like water running down a river bed.

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13y ago

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