These stainless steel batwing throttle shafts have a relief on each side of the butterfly screw for better airflow through the carb body. The stainless shaft will also eliminate the bent or broken shafts that can sometimes occur in these style carburetors.

Also included is a hardened C-clip to hold the shaft in place, a black anodized billet aluminum cup that traps the C-clip from being able to come off

The original brass throttle shaft is prone for flexing and wearing therefore leaking air past the shaft making it difficult to keep in a proper tune.

Using this shaft will decrease flexing and wear, keeping your engine in precise tune. 

Used in Walbro model carburetors: WT603B/668/990/1048/1107. Not for use in WT813.