Mikuni Bs26 Carburetor Manual Verified «Edge»
The Ultimate Mikuni BS26 Carburetor Manual & Tuning Guide The Mikuni BS26 is a 26mm constant velocity (CV) carburetor widely used on small-displacement motorcycles, ATVs, and scooters. Known for its fuel efficiency and smooth throttle response, it is a staple on machines like the Suzuki GN125, Yamaha Virago 250 (XV250), and various 125cc to 250cc Chinese imports.
Specifically for removing the pilot jet without damaging the slot. Needle-Nose Pliers: For removing the float needle seat.
| Fastener | Verified Torque (in-lbs) | Warning | | :--- | :--- | :--- | | Float Bowl screws | 7-9 in-lbs | Use a JIS screwdriver, not Phillips. | | Top cap screws (diaphragm cover) | 4-6 in-lbs | Overtightening distorts the diaphragm sealing surface. | | Drain plug (bottom of bowl) | 13 in-lbs | Replace the copper crush washer every time. | | Choke plunger nut | Hand tight + 1/8 turn | Plastic threads—do not use tools. | mikuni bs26 carburetor manual verified
By following the guidelines outlined in this article, motorcycle enthusiasts can ensure their Mikuni BS26 carburetor is running optimally and providing the best possible performance.
Turn the pilot screw in/out in 1/2 turn increments every 10 seconds until the engine reaches its highest, steadiest idle. The Ultimate Mikuni BS26 Carburetor Manual & Tuning
The BS26 designation indicates:
in the choke cable. Lack of slack can cause the plunger to stay partially open, leading to a rich mixture and poor idling. Common Troubleshooting BS Carburetors - Mikuni Power Needle-Nose Pliers: For removing the float needle seat
The specific you are experiencing (e.g., fuel leaking, bogging at high speed, hard starting) Any modifications made to the exhaust or air intake
With BS26 on parallel twins (e.g., GS500), syncing is mandatory: