Exhaust muffler and muffler system for use with an internal...

Power plants – Internal combustion engine with treatment or handling of... – Having vibration attenuating – or expansion and contraction...

Reexamination Certificate

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Details

C060S305000, C060S312000, C060S313000, C060S314000, C060S323000, C181S277000, C181S231000, C181S241000, C181S255000

Reexamination Certificate

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06941751

ABSTRACT:
An exhaust muffler system for use on a motorcycle or four-wheeled vehicle provides for operation in either of two modes, a regular configuration that provides a high degree of noise reduction, or a racing specification that provides for a freer-flowing exhaust. Without changing the main body of the muffler, an operator can choose between a quieter, public road setting or a louder, high performance setting. The muffler is provided with two interchangeable spark arresters, and a main body having multiple expansion chambers therein, defined by bulkheads. When a regular spark arrester is installed, exhaust gas passes through one bulkhead three times, greatly reducing the noise produced. With the spark arrester removed, the exhaust gas passes straight through to the open air, enhancing performance. A seal is provided between the bulkheads and the spark arrester, which provides for extension or retraction in the lengthwise direction of the tail pipe.

REFERENCES:
patent: 3677364 (1972-07-01), Pawlina
patent: 3786896 (1974-01-01), Foster et al.
patent: 5451728 (1995-09-01), Chandler et al.
patent: 5627351 (1997-05-01), Okuma et al.
patent: 5857327 (1999-01-01), Sato et al.
patent: 5969299 (1999-10-01), Yamaguchi et al.
patent: 6394225 (2002-05-01), Yasuda
patent: 10266828 (1998-10-01), None

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