The Japanese Yamaha Motor Company began manufacturing the YBR 125 light motorcycle in 2005. From 2005 to 2007, the engine used a carburettor; the models released since employ electronic fuel injection. A YBR 125 can seat one passenger and a driver. Editors at Motorcycle News praised this motorcycle's responsive handling and comfortable ride, calling the YBR 125 a "pretty good value for the money."
Yamaha equipped the YBR 125 with a single-cylinder, single-overhead-cam 124cc displacement engine. Two-valves feed gas into the cylinder via an electronic fuel injection system. The engine transmits power through a five-speed chain-driven transmission with a cable-operated clutch. A head-shield protects the driver and riders from excessive heat, and the YBR 125 uses the air flow during riding to cool the engine. Riders can either kick start the YBR 125 or use a push-button electronic starter.
Each YBR 125 rides on 2.75 x 18 front tires and size 90/90 x 18 rear tires and uses 245mm front single-disc and 130mm rear drum brakes. The YBR 125 boasts a curb weight of 125kg. (125kg) with a full tank of gas and weighs 113kg. when empty. A YBR 125 stands 42.5 inches in height, has a length of 78 inches and spans a wheelbase (width) of 29.3 inches. Its chassis has a ground clearance of 6.89 inches with a seat height of 30.7 inches.
Yamaha's small 124cc engine achieves a compression ratio of 10:1 and cranks out 10 horsepower at 7,800rpm and seven ft-lb of torque (the amount of the bike's forward thrust) at 6,100rpm. This amount of power enables the motorcycle to accelerate from 0 to 60mph in 19.2 seconds and cover a quarter-mile in 19 seconds. The YBR 125 features a 3.43 gallon fuel tank and Motorcycle News reports that it earns an average of 90 miles-per-gallon. Motorcycle News reports that drivers can hit a top speed of 70mph and will find the most comfortable cruising speed around 55mph.
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