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Honda develops new engine for 125cc scooters

ABR Staff Writer Published 27 September 2011

Honda Motor has developed a new next-generation 125cc scooter engine that is 25% more fuel efficient than the existing one.

The company said that the improved fuel economy was realized by reducing internal friction and increasing cooling performance.

The auto maker aims to start using the new engine in 125cc-class scooters for sale worldwide starting from 2012.

The new liquid-cooled, 125cc, 4-stroke, single-cylinder engine incorporates a range of low-friction technologies while packing its lighter weight in a more compact body.

The company said that the new engine was developed to reduce CO2 emissions on a global scale, through the further enhancement of engine performance and fuel economy.

The new engine includes a radiator core with high cooling efficiency, which enables a smaller and lighter cooling fan on the back of the radiator and reduces friction loss by approximately 30%.

Transmission oil capacity is reduced 25% compared to current 125cc engines through modifications inside the transmission case in order to lower the oil agitation loss.

Bearings for each of the three axes in the transmission unit are designed as per the load received, resulting in an optimal set of specifications that lessen the rolling resistance inside the bearings.

Friction loss has been reduced by approximately 20% compared to the current engine (when running at 50km/h).