22-room 1200 rpm gearbox jitter

Too much carbon deposit, too dirty throttle or air filter, too dirty air filter, just clean it.

1 and 22-room-melting engines have too much carbon deposit, which will absorb a certain amount of engine oil and make the mixture too low. The solution is to remove carbon deposits from the engine.

The unclean air filter in the 2.22 room-melting engine will lead to insufficient air entering the engine cylinder, and the unbalanced mixing ratio will lead to insufficient engine power and jitter. Just cleaning the air filter.