Browse Publications Technical Papers 2002-32-1827
2002-10-29

Development of Light-weight 250 cm3 4-stroke Engine 2002-32-1827

The 250 cm3 4-stroke engine, which is lighter in weight than the 2-stroke engine, was developed as a means to improve the overall performance of a motocrosser.
It was a widely accepted opinion that the 4-stroke engine come out heavier, in general, by approximately 20% than the 2-stroke engine. Challenging this opinion, we carried out our task under the design concepts of:
  1. 1)
    Making use of advantages of the 4-stroke engine.
    Lightens the crank web and crankcase by reducing the moment of inertia and reduces the height and weight with the use of a very short stroke.
  2. 2)
    Turning disadvantages of the 2-stroke engine into advantages.
    Lightens the driveline components, pistons and crankcase components with the use of a design adapted to the output.

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