User Manual PowerSmart DB2322SR Self Propelled Lawn Mower

The engine for this gas powered lawn mower, is an 4-stroke 170cc OHV engine.

Yes it does, however if the grass or leaves are moist or you have to tall of grass, the mower clogs up on the inside and it will throw the belt off that activates the self propelled part of the mower. Hope that isn't to confusing.

There is only one speed for the self-propelled.