Exhaust Valves
"Exhaust valve" means different things on different machines, and this page carries parts for all of them — so start by finding your type.
Street bikes with an exhaust servo. Most modern sport bikes and many nakeds run a motor-driven valve in the exhaust. Fit a slip-on or full system that deletes that valve and the ECU throws a servo fault (often a FI light) because the motor is no longer connected. A Woodcraft Servo Buddy plugs into the servo connector and mimics the motor's position signal, so you can remove the servo and cable without triggering the fault light. Servo Buddies are make- and model-specific — the 42-xxxx part number in each listing is matched to the bike's connector and servo type, so confirm the listed fitment against your exact model and year before ordering. Pair one with an aftermarket slip-on from the main exhaust section.
Snowmobiles with variable exhaust valves. Two-stroke sleds use power valves in the exhaust ports, and on many models they are actuated by a cable. SPI exhaust valve cables (SM-05xxx series) replace stretched or frayed OEM cables that leave the valves slow to open and the engine flat on top. Match the SM part number to your model and engine from the listing.
Personal watercraft. The single WSM Kawasaki exhaust shim is a service part for Kawasaki Jet Ski exhaust systems — check the 007-321 application before ordering.
A Servo Buddy removes the fault and a new cable restores the original valve action; neither adds power by itself.
Free shipping on orders $50+ (Lower 48).
