1.前言因摩托车不受混乱交通的限制并具有行驶快慢自如的优点,所以它拥有许多使用者. 就这种摩托车的车架来说,在形式上大同小异并无很大变化,但就发动机性能来说,进展却很大.现依时间顺序叙述如下. 2.1945年以前的情况据记忆,1945年以前日本共有四个摩托车制造厂,其中两个生产四冲程车,两个生产二冲程车. 当时的四冲程机主要是大排量的,为500和1200毫升,其型式为单缸和V形双缸,长冲 1. Introduction Motorcycles do not suffer from chaotic traffic restrictions and have the advantage of speed and ease, so it has many users.To the motorcycle frame, in the same form has not changed a lot, but Engine performance, the progress has been very large.Currently described in chronological order are as follows.2.The situation before 1945 It is remembered that before 1945 there were four motorcycle manufacturing plants in Japan, of which two produced four-stroke vehicles and two produced two-stroke At the time of the four-stroke machine is mainly a large displacement of 500 and 1200 ml, the type of single cylinder and V-shaped cylinder, long red