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2 stroke
A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of the crankshaft. A four-stroke engine requires four strokes of the piston to complete a power cycle during two crankshaft revolutions. In a two-stroke engine, the end of the combustion stroke and the beginning of the compression stroke happen simultaneously, with the intake and exhaust (or scavenging) functions occurring at the same time.
Two-stroke engines often have a high power-to-weight ratio, power being available in a narrow range of rotational speeds called the power band. Two-stroke engines have fewer moving parts than four-stroke engines.
Looking to build a vintage go kart? These lil Yamaha's were screamers for their displacement, 2 strokes are fun lil beasts.
New points, piston, piston rings, gaskets, and I think it has the oil pump block off plate in that bag too. You'd use them if you didnt want to run an oil tank too, just...