N189192 Starter plunger

This Mikuni starter plunger is the internal component responsible for opening the enrichment circuit during cold starts on HSR series carburetors. When the choke cable is pulled, this plunger moves to allow additional fuel into the intake tract, facilitating easier starting. It is precision-machined to ensure a perfect seal when closed, preventing unwanted fuel from entering the engine during normal running conditions. As a genuine Mikuni part, it is manufactured to the exact specifications required for the HSR's starter bore. This starter plunger is sold individually and is a key component for maintaining reliable starting performance on your Harley-Davidson.