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If the 4-stroke 50 cc engine were to tip over, is there anything to prevent oil from draining into the cylinder and carburetor? I know it is not likely, but that is the nature of the 4-stroke engines as i understand it.

Yes, you're right if the engine is left leaning on the front side oil can flow into carburetor and cylinder. However this is unlikely to happen in operation as it will more likely tilt from side to side because of the weight distribution. Only in transport is it important to prevent forward tilting in case of sudden stop or other event by securing the cargo.

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