The Yamaha YBR 125 has a single-cylinder, air-cooled, four-stroke engine, displacing 123.7 cc. This Yamaha Motor Corporation engine is balanced to minimize vibration, is lean-burn to reduce harmful emissions, and has low noise output. A catalytic converter is built into the exhaust pipe. It is essentially the same engine as found in the Yamaha XTZ trial model. It is a simple, reliable, low-maintenance, high-economy unit. (This engine is also used by Sher co in their City Corp 125 motorcycle). It can develop a maximum of 12 horsepower at 8,000 revolutions per minute, and maximum torque of 11.6 Nm at 6,500 rpm, but the European version with Catalysator (2005) can develop a maximum of 10.3 horsepower (7.7 kW) at 7,600 rpm, and maximum torque of 10 Nm. It has electric start and CDI ignition.
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