A control module for a walk behind trowel configured to detect and to prevent an uncontrolled or undesirable motion of the trowel. The trowel includes an engine configured to drive rotation of a rotor. The control module includes a gyroscope and a controll...

A starter module configured to limit an engine speed of an engine for a walk behind trowel at time of startup. The walk behind trowel includes a rotor driven by the engine, a throttle to command an operating state of the walk behind trowel, and a clutch op...

A diaphragm carburetor-based fuel supply system (46) is equipped with an air purge system (48) that vents trapped air from the fuel supply system (46). The air purge system (48) preferably includes a vent tube (90) having an outlet opening (94) into the up...