Mikuni Bds26 Service Manual Updated May 2026

Mikuni BDS26 is a 26mm constant velocity (CV) carburetor commonly found on motorcycles like the Yamaha XJ600 Seca II (Diversion) Hyosung GV250

. Servicing these units requires precise float height adjustments and thorough cleaning of their small internal passages to ensure smooth throttle response. Essential Service Specifications

Standard factory settings can vary slightly by motorcycle model, but the following are common baseline values: Standard Specification Float Height (Dry) 6.2 mm – 8.2 mm (often set to for balance) Main Jet (M.J.) #90 (Front), #87.5 (Rear) for some models Pilot Jet (P.J.) 1,450 – 1,550 rpm Pilot Screw 2.5 turns out from lightly seated Step-by-Step Rebuild Guide mikuni bds26 service manual

For a complete overhaul, use a high-quality rebuild kit from retailers like All Balls Racing

, which typically include new O-rings, gaskets, and needle valves. Mikuni BDS26 Carburetor Specifications | PDF - Scribd Mikuni BDS26 is a 26mm constant velocity (CV)

Here’s a conceptual piece written in the style of an excerpt you might find in a hypothetical Mikuni BDS26 Service Manual. It blends technical instruction with the kind of cautionary, detail-oriented tone typical of factory manuals.

Step A: Removal from Bike

1. Turn the fuel petcock to "OFF" and drain the carburetor bowl (screw on the bottom).
2. Loosen the clamps on the intake boot and air filter boot.
3. Twist and pull the carb off the boots.
4. Remove the throttle cables (top cap) and choke cable.

3. Adjusting the Float Level

1. Check the float level: Consult the service manual for the recommended float level.
2. Adjust the float level: Use a float level gauge or adjust the float arm to achieve the recommended level.

1. Disassembly and Cleaning

According to the manual, start by removing the carburetor from the intake manifold. Do not remove the throttle shaft unless absolutely necessary—it contains tiny, unserviceable bearings. Step A: Removal from Bike

Critical step from the manual: Remove the top cap (4 screws). Carefully lift out the vacuum piston/diaphragm assembly. Do not use solvent on the diaphragm. Use only soapy water. Soak the metal body in carb cleaner for 4 hours, but remove all rubber first.