In response to increasingly stringent emissions legislation, the number of four-stroke motorcycle is more and more, so it is necessary to develop the special four-stroke motorcycle engine oil.
随着我国环保法规的日益严格,四沖程摩托车数量越来越多,开发专门的四沖程摩托车油非常必要。
This paper introduces the design of valves of four-stroke motorcycle engines and relating problems on material selection and their influences on engine performances.