Harley-Davidson Motor Company Group, LLC

Buell Motorcycle Company

Timothy R Osterberg

Stacy L Smith

William P Pari

Alexander John Bozmoski

Richard G Pierson

Philip Pierce

Michael P Christopherson

Michael A Selwa

Anthony L Coffey

Michael R Richter

The present invention provides a method of operating a dynamic exhaust system of a motorcycle engine. The method includes providing a valve in the exhaust system that is movable to direct exhaust gases between a first flow path through the exhaust system and a second flow path through the exhaust system. The method includes actuating the valve at a first speed to redirect exhaust gases from the first flow path to the second flow path and actuating the valve at a second speed greater than the first speed to redirect exhaust gases from the second flow path to the first flow path.

Motorcycle dynamic exhaust system

An exhaust system for use with a four-stroke engine having first and second cylinders. The cylinders generate exhaust pulses at uneven time intervals with respect to each other. The exhaust system includes a muffler and first and second exhaust pipes that communicate between the mufflers and the first and second cylinders, respectively. The first and second pipes being sized and shaped to deliver the exhaust pulses to the muffler at even time intervals with respect to each other.

Motorcycle exhaust system

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Hubertus, WI, United States of America

Timothy R Osterberg