Mikuni Bs26 Carburetor Manual Verified Review

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.

This is the #1 fix for idle problems on a BS26.

Turn the idle mixture screw clockwise until it stops gently. mikuni bs26 carburetor manual verified

Invert the slide to remove the plastic needle retainer, spring, and the jet needle. Step 2: Float Bowl Assembly Disassembly Flip the carburetor upside down.

| Modification | Required change | Jet size change | |--------------|----------------|------------------| | Pod filter (no airbox) | Impossible to tune well – BS26 needs airbox restriction | +2 on main jet, raise needle 1 clip, pilot +2 sizes – but still runs poorly | | High-flow exhaust | Usually none | Only if popping on decel → +1 on pilot jet | | High altitude (>2,000m) | Drop main jet by 1 size per 1,000m | Example: #100 → #95 | The Ultimate Mikuni BS26 Carburetor Manual & Tuning

“You need to drill out a plug to adjust the pilot screw.”

Spray aerosol carburetor cleaner through every open orifice and brass jet. Turn the idle mixture screw clockwise until it stops gently

This is the heart of your search for a "Mikuni BS26 carburetor manual verified." Below are the from Suzuki literature. Note that emissions regulations changed by year, so we have listed the most common (1994-2000 GS500 baseline, which applies to most BS26 units).

The following diagrams and illustrations are provided to help with the understanding of the Mikuni BS26 carburetor: