My Revo 150 motorcycle tricycle engine can't be equipped with an air filter and can't fill the gas door! Who knows what's wrong with it

One is that the carburetor may be broken, and the other is that the air filter is blocked (whether the filter refuels too much by itself). Third, the carburetor return pump is broken. Fourth, check whether the oil circuit and filter cup are blocked but not tightly. All the above reasons may cause the engine to stall when the throttle is open. If there are the above reasons, the engine mixture will be diluted and the engine will stall.

Clean the filter:

The sponge wet filter element can be cleaned with clean water and detergent, then dried and coated with a little engine oil on the air inlet side. Don't clean them with gasoline, or the pores of the sponge filter will expand and lose the filtering effect. If it is a paper dry filter element, it can be tapped gently on the ground to shake off the dust, and then blown from the inside out with compressed air from the air pump (from the opposite direction of air intake). If the filter element is too dirty, airtight or has penetrated the ash, it should be replaced with a qualified filter element.