Exhaust timing control apparatus.

摘要

Apparatus for controlling the timing of exhaust operation in a two-cycle engine includes a pivotally mounted valve body (9) positioned in a recess (7) in the upper surface of an exhaust passage (5). The valve body includes a shaft bearing portion (10) above the pivot axis, of substantial strength. A plate (11) extending from that bearing portion is reduced in thickness with a upwardly extending ridge (12) at the outer end thereof to define a control surface (13) and sealing mechanism for the plate. The cooperation between the exhaust port and the end of the valve body may be arranged for maximum sealing and maximum wall thickness of the surrounding port.