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The GY6 engine design is a four-stroke single-cylinder in a near-horizontal orientation that is used on a number of small motorcycles or scooters made in Taiwan, China, and other southeast Asian countries. It has since become a generic technology.
The advantage of the split-single engine compared to a conventional two-stroke engine is that the split-single can give better exhaust scavenging while minimizing the loss of fresh fuel/air charge through the exhaust port. As a consequence, a split-single engine can deliver better economy, and may run better at small throttle openings.
The Rotax Type 256 is a 250 cc (15 cu in) two-stroke parallel twin-cylinder racing engine, designed, developed and produced by Rotax, between 1980 and 1998.It was primary used in kart (especially kart racing) applications, as well as motorcycle racing applications, such as competing in the 250cc class of the Grand Prix motorcycle World Championship.
Note there is no single fixed definition of a scooter (also known by the full name motor-scooter), but generally a smaller motorcycle with a step-through frame is considered a scooter, especially if it has a floor for the rider's feet (as opposed to straddling the vehicle like a conventional motorcycle).
The other is the specific "-3" engine made by BenNeng (code: BN), also referred to as a GY6-B engine. These engines have a taller head, unique crankshaft, and an extra long swingarm to accommodate a 16" rim. I have to agree that there is no known use of the GY6 engine in an actual Honda product.
Machinery was installed and training given by Villiers, the first engine, a 125 cc single coming off the production line in September. In 1954 a 197 cc engine was introduced and the following year the factory extended to increase production to 10,000 units per year. [11] 250 and 325 cc twin-cylinder engines were added to the range in 1958. [12]
The Puch 250 SGS (Schwing-Gabel-Sport) is a motorcycle that was manufactured by the Austrian Steyr Daimler Puch AG's Puch division in Thondorf near Graz.The motorcycle is powered by a split-single two-stroke engine (two pistons sharing a single combustion chamber).
A 250cc air-cooled twin two-stroke design includes a 12v battery ignition and a five-speed transmission. Making nearly 30 hp (22 kW) @ 7,500 r/min, the published top speed was 93 mph, with a 1/4 14.8 second quarter mile time.