Why is the throttle of Magotan engine always dirty?

Due to the poor design of engine oil and gas recovery device, many oil and gas can not be recovered effectively. These oil vapors are directly discharged into the atmosphere, which will cause pollution. In order to protect the environment, they must be sent to the engine cylinder for combustion. There is a pipe for recovering oil and gas before and after the throttle of this engine. When steam meets relatively cold air at the throttle, it will condense into small oil droplets and attach to the throttle. These small oil droplets easily absorb small dust, so the throttle is easy to get dirty. Solution: Replace the air filter frequently. The filter should be the original factory or the products of international manufacturers such as Mahler and Manpai.