Definitely 2 stroke as it has a dellorto carb. 
Also I agree it looks like a rotax engine to me also.
God knows what’s been installed between the carb and engine though where reeds should be.
That belt wouldn’t last long I know that 
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When these homes were built, city sewer systems were crude, unreliable and prone to backups. When backups occurred, sewage would enter homes and overflow from the fixtures lowest to the ground, so the basement toilet acted as a safety valve – placed right above the sewer line where it came in from the street.
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my money’s on the ant.
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