Abstract
<div class="htmlview paragraph">The 250 cm<sup>3</sup> 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.</div> <div class="htmlview paragraph">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:</div> <div class="htmlview paragraph"> <ol class="list nostyle"> <li class="list-item"> <span class="li-label">1)</span> <div class="htmlview paragraph">Making use of advantages of the 4-stroke engine.</div> <div class="htmlview paragraph">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.</div> </li> <li class="list-item"> <span class="li-label">2)</span> <div class="htmlview paragraph">Turning disadvantages of the 2-stroke engine into advantages.</div> <div class="htmlview paragraph">Lightens the driveline components, pistons and crankcase components with the use of a design adapted to the output.</div> </li> </ol> </div>
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