The entry point for fuel into the bowl. Contains a rubber tip prone to wear.
#95 to #110 (Varies by vehicle manufacturer) Pilot Jet (Stock standard): #15 to #22.5
With BS26 on parallel twins (e.g., GS500), syncing is mandatory:
Carefully pull the float pin out to remove the float assembly and the needle valve.
Tuning must follow a specific sequence, from the bottom of the RPM range to the top.
✅ Verified: The BS26 does have an accelerator pump; it relies on CV vacuum lag to prevent lean hesitation.
The Mikuni BS26 carburetor is a reliable and performance-oriented carburetor model. By following the verified guide provided in this article, you can ensure proper adjustment, maintenance, and repair of your Mikuni BS26 carburetor. Remember to consult the official Mikuni carburetor manual and other verified sources for specific information on your carburetor model.
The diaphragm must be completely free of pinholes, tears, or stiffness.
Check that choke seats fully; reduce main jet size if modified.
When your engine stumbles, hesitates, or refuses to idle, a verified factory manual approach is essential to restore performance. This comprehensive technical guide serves as your verified workshop reference for rebuilding, tuning, and troubleshooting the Mikuni BS26. 1. Core Specifications and Identification
Clean out the needle valve seat. Replace the needle valve if a wear groove appears on its rubber tip. Drop the float in a cup of water to ensure it floats high and does not leak internally.
The Ultimate Mikuni BS26 Carburetor Manual: Tuning, Rebuilding, and Specifications