Mikuni Bs26 Carburetor Manual Verified

Disclaimer: Mikuni carburetors are designed for specific applications, and jetting may vary depending on altitude and modifications (e.g., exhaust or air filter changes).

Provides a richer mixture for cold starts. Key Components of the BS26: Diaphragm/Slide: Creates the CV effect. Main Jet: Determines high-RPM fueling. Pilot Jet/Screw: Controls idle mixture. Jet Needle: Adjustable to fine-tune midrange (5 notches). 2. Verified Mikuni BS26 Tuning & Adjustment Procedure

The BS26 operates on a variable venturi design where a vacuum-operated diaphragm controls the slide lift, ensuring smooth throttle response across various engine speeds. Most tuning issues originate in one of five metering systems:

Turn the carburetor upside down and remove the float bowl screws. If the screws are seized, use an impact screwdriver to avoid stripping the soft JIS (Japanese Industrial Standard) heads. mikuni bs26 carburetor manual verified

The (often found as the BS26SS or BDS26) is a 26mm constant-velocity (CV) carburetor widely used on bikes like the Suzuki GN125, GS125 , and the Yamaha XJ600 Seca II . 🛠️ Key Specifications (Verified)

Are you running a , or are they aftermarket mods?

Tuning must follow a specific sequence, from the bottom of the RPM range to the top. Main Jet: Determines high-RPM fueling

Using a digital caliper, measure the distance from the mixing chamber gasket surface (gasket removed) to the highest point of the float.

Once installed, use these diagnostic procedures to dial in performance. Pilot Circuit Tuning (Idle to 1/4 Throttle) Warm the engine to operating temperature.

Required to accurately measure and set the float height to factory specifications. Step-by-Step Teardown Highlights: Preparation: and emulsion tube (needle jet).

Key components verified from exploded parts diagrams:

Tucked inside a recessed tunnel next to the main jet. Controls idle to 1/4 throttle. 3. Step-by-Step Rebuild Guide

Remove the main jet, pilot jet, and emulsion tube (needle jet).

Use a digital caliper or a float gauge to measure the distance from the gasket mating surface (without the gasket) to the highest point of the float profile. Verify the measurement is .