Mikuni Bds26 Service Manual -

Carefully bend the small metal tang on the float to reach the correct height. Step 4: Reassembly

The manual lists tools not in a standard toolbox:

When rebuilding, to prevent fuel leaks. Steps for Assembly

Loosen the clamps on the intake boots and airbox.

| Symptom | Likely Cause (BDS26-specific) | |---------|-------------------------------| | Bog on acceleration | Torn diaphragm (vacuum piston fails to rise) | | Rich surge at cruise | Incorrect float height (too high) or worn needle jet orifice | | Lean pop on decel | Pilot jet partially blocked or air leak at diaphragm cap | | Stuck high idle | Choke plunger binding or throttle shaft rust (common on stored bikes) | mikuni bds26 service manual

to visualizing the cleaning process.

| Temperature | Altitude | Main Jet | Pilot Jet | Air Screw (turns out) | |-------------|----------|----------|-----------|------------------------| | -10°C to 0°C | 0-3000ft | 135 | 25 | 1.75 | | 0°C to 10°C | 3000-6000ft | 130 | 22.5 | 2.0 | | 10°C+ | 6000ft+ | 125 | 20 | 2.25 |

use welding tip cleaners or steel wire to clear jet holes; steel alters the precise calibration of soft brass orifices. Use compressed air instead. Component Inspection Checklist

Because it relies on engine vacuum to actuate the slides, precise maintenance is critical for smooth throttle response and reliable idling. This comprehensive service guide covers everything from teardown to synchronization. Technical Specifications & Factory Jetting Reference Carefully bend the small metal tang on the

Unscrew the top covers. Carefully pull out the slide and diaphragm. Inspect the rubber for pinholes or tears by holding it up to a light. If it’s torn, the slide won’t lift, and the bike will lose power.

Following this guide will ensure your carburetor operates at peak performance. Regular maintenance—specifically draining the bowls during winter storage—will prevent the common clogging issues associated with modern fuels.

Install new pilot and main jets if your rebuild kit includes them.

Use with extreme caution to avoid enlarging precision orifices. Disassembly Procedure 1. External Components and Top Cover Component Inspection Checklist Because it relies on engine

The Ultimate Mikuni BDS26 Carburetor Service Manual & Rebuild Guide

Having the right tools and information ready will save you significant time and frustration.

: If your engine has a hanging idle or runs lean despite proper jetting, the throttle shaft seals may be leaking air. Specialized guides like the LiteTek Rebuild Guide

The BDS26 is a masterpiece of mechanical fueling, but its complexity and scarcity of parts mean a Without the vacuum sync procedure, float height nuance, and diaphragm handling warnings, the carburetor rapidly becomes an unreliable “boat anchor.”

✅ Only use genuine Mikuni BDS26 diaphragms. Aftermarket “universal” types often have incorrect shore hardness, causing erratic slide rise.