Fukang air filter and throttle can't be inserted.

No, it depends on the air outlet (that is, connected to the engine end). There are many air inlets here that can leak air. Only plug the interface of the air filter, and there are at least three air inlets, one is the atmospheric balance hole leading to the oil pool, and the other is the bottom oil drain, which is the overflow port of the filter inside. There is also a throttle pipe installation hole, which passes through the throttle and is not completely closed. The adjusting screw on the throttle valve is not closed. If there is a manual throttle, all through shafts are not closed.

Therefore, if you block the air filter inlet by hand and start the engine, you will not only suck incomplete gas, but also suck a lot of gasoline back into your palm. We often use this method to enrich the mixed steam to achieve the purpose of good start-up, and use it to deal with carburetor with too thin mixed steam.