The Rainbow 90 is made in China, the Rainbow 90 is generally Louis' engine, and the other one is Taiwan Province Goldwind 90 designed by Yamaha. Both of them are made in China, but other manufacturers are much worse. Jialing was the best at that time. Jialing started its own production (imitation) that year, and was afraid to imitate Honda in Japan that year. The overall performance of imitation is undoubtedly the same as that of Honda.

Working principle of motorcycle engine;

Motorcycle engine is a machine that ignites the fuel mixture entering the cylinder and converts the heat energy generated by its combustion into mechanical energy. The crankshaft transmits the power to the motorcycle rear wheel through the transmission mechanism and becomes the driving force of the vehicle. Because gasoline engines have the advantages of light weight, small volume, low noise and vibration, easy starting and low cost, gasoline engines are widely used as power devices for motorcycles.

Basic knowledge of motorcycle engine:

"Engine" can literally be understood as a machine that generates power. According to the different ways of energy conversion, it can be divided into motor (electric energy → mechanical energy), hydraulic machine (water energy → mechanical energy), wind generator (wind energy → mechanical energy), atomic engine (atomic energy → mechanical energy) and heat engine (thermal energy → mechanical energy). Heat engines can be divided into external combustion and internal combustion, and motorcycle engines are one of them.