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Mikuni - Bs26 Carburetor Manual Verified

The Mikuni BS26 is a Constant Velocity (CV) carburetor commonly found on small-displacement motorcycles like the Suzuki GS125, GN125, and Burgman 125/150. Verified manual data emphasizes that the carburetor operates through five overlapping metering systems—pilot, throttle valve, needle jet/needle, main jet, and choke—which primarily regulate performance between 1,750 and 4,500 RPM. Core Specifications & Tuning Data

Float Height: Typically 17mm to 18.5mm (measured from the gasket surface to the top of the float without compressing the spring). 3. Step-by-Step Cleaning & Inspection

Rebuild Tools: Use JIS (Japanese Industrial Standard) Phillips screwdrivers to avoid stripping the soft brass or aluminum screws common on these units. Step-by-Step Tuning Order mikuni bs26 carburetor manual verified

To restore performance, a thorough teardown is often more effective than a generic "rebuild kit" if internal parts are not physically damaged.

I used it specifically for a rebuild on my Suzuki, and the float height settings and pilot screw defaults matched perfectly. It saved me from guessing and potentially ruining a tricky carburetor clean. If you are tuning or rebuilding a BS26, this is the authoritative source you need. Highly recommended for the accuracy alone." The Mikuni BS26 is a Constant Velocity (CV)

The Complete Guide to the Mikuni BS26 Carburetor: Verified Specifications & Tuning Manual

Introduction

The Mikuni BS26 is a constant velocity (CV) carburetor found predominantly on 250cc parallel-twin motorcycles from the late 1980s through the early 2000s. You’ll find it on the Suzuki GSX250, Across (GF250), Kawasaki GPZ250 (ZZR250), and the Bajaj Pulsar 220.

Proper maintenance requires specific tools and a systematic approach to avoid damaging internal brass components. Verified Tool List: JIS (#2 & #3) Screwdrivers: Carb rebuild kit (diaphragm, float valve, needles, O-rings,

Parts & Consumables Checklist for a Full Rebuild

  • Carb rebuild kit (diaphragm, float valve, needles, O-rings, gaskets)
  • Main and pilot jet assortment
  • Float (or float valve) replacement if warped
  • Ultrasonic-safe cleaning solution and compressed air
  • Jet gauge and small torque driver set
  • New fuel line and clamps if aged

Symptoms of wrong height: