Abstract: The present invention includes a muffler for attachment to an engine that includes an inlet for receiving exhaust gases into the muffler, a catalyst assembly located within the muffler, and a fastener tube for fastening the muffler to the engine. A fastener tube cover covers the fastener tube and includes an outlet for exiting exhaust gases. The outlet includes a directional louver that directs the exiting exhaust gases. The fastener tube cover can retain a spark arrestor which maintains maximum spark particle size in the exiting exhaust gases.

Abstract: A composite crankshaft counterweight of a two-cycle internal combustion engine includes a “T” shaped counterweight surrounded by a cup-shaped retainer that holds light weight inserts against the counterweight. Together with the counterweight the inserts create a full circle that reduces the empty volume in a crankcase of a two-cycle engine.

Abstract: A composite cranks haft counterweight of a two-cycle internal combustion engine includes a “T” shaped counterweight surrounded by a cup-shaped retainer that holds light weight inserts against the counterweight. Together with the counterweight the inserts create a full circle that reduces the empty volume in a crankcase of a two-cycle engine.