A seal (42) for an air valve having a valve shaft (32) rotatably carried in a bore (36) formed in a body (11) and a valve head (34) carried by the valve shaft (32) to control air flow through an air passage (14) as the valve shaft (32) is rotated. The seal...

A kill-switch control circuit for use with a light-duty combustion engine determines whether to execute a controlled shut down method or an immediate shut down method in response to kill-switch activation. The selection of a shut down method is made, at le...

A method and system for operating an engine wherein ignition of the engine is activated according to a predetermined timing schedule that references engine speed, and the ignition is suppressed above a predetermined engine speed threshold to allow engine s...

A manual pull-cord start system of a combustion engine has a remote start assist device such as a choke (50) of a carburetor (34) or a compression relief valve that is automatically actuated upon the initial pull of a pull-cord of a recoil starter assembly...

A carburetor (20) has an air intake passage (24), a fuel passage, a fuel nozzle (32) in communication with the fuel passage (30) and having an opening through which fuel flows, a first valve (28) in communication with the air intake passage (24) and being ...

An apparatus (10) for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine. The apparatus (10) has a needle valve body (18) and a receptacle (12) formed in a main body of a carburetor which receives the needle valve body. The needle v...

A carburetor for a scavenged two-stroke internal combustion engine has an enriched fuel-and-air mixing passage (26) extending through a housing of the carburetor (10). Engaged to the housing is a body of an air flow modular assembly (12) which carries a pr...

A control system for a low cost, light duty combustion engine, where the control system generally utilizes an engine speed input signal and independent operating sequences to determine a desired ignition timing and air-to-fuel ratio for a combustible mixtu...