Yamaha QT50
The Yamaha QT50 Yamahopper was a moped produced by the Yamaha Motor Company from 1979 through 1992. These small mopeds are easy to ride, maintain, are fuel efficient (135mpg) and were quite popular during its day. Being so small, it has a "maximum loading" limit of around 186lbs, although that figure can be stretched at the cost of performance. The two-stroke, 49cc single-cylinder engine was almost square, with a bore of 40mm, stroke, 39.2mm; making riding legal without a motorcycle license in some states because its engine is under 50cc. It included turn signals, a solid state CD ignition, front and rear luggage carriers and drum brakes at each end. Compression ratio was 6:1. The carburetor VM12S was a Mikuni VM12SC, running fuel through a reed valve. The valve’s bending: 0.8mm. Yamaha’s Autolube system made sure the gas and oil mixture was close to perfect. The QT50 resembles contemporary mopeds yet shares some features with scooters.
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