What the BN38/39 Part Represents

• Part Number: BN38/39

• Description: Aluminum high-speed mixture screw washer, used to seal the high-speed adjuster in Super BN carburetors. It’s featured as Diagram Part #26 in the exploded parts layout.

This washer ensures a proper seal around the high-speed mixture adjustment screw, preventing fuel seepage and maintaining precise tuning.

Compatibility

• Found in Super BN-series square-pump carburetors such as:

  • BN34

  • BN38

  • BN44

  • BN46

  • Also in variants BN38I and BN40I