Mikuni Bds26 Service Manual ((new))

| 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) |

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Usually due to clogged pilot jets or improperly adjusted idle mixture screws. mikuni bds26 service manual

May indicate a torn vacuum diaphragm or incorrectly sized main jets. mikuni bds26 service manual

| Symptom | Likely Cause (per manual) | Fix | |---------|---------------------------|-----| | Engine bogs on acceleration | Torn diaphragm or clogged vacuum port | Replace diaphragm, blow out vacuum passage with compressed air | | Black smoke / rich running | Float too high or stuck needle | Reset float height to 15mm, replace needle valve | | Hard starting when cold | Enrichener (choke) plunger not seating | Clean plunger and bore, check O-ring | | Surges at steady throttle | Air leak at carb base or slide guide wear | Replace intake boot gasket, check slide for scratches | | Won’t rev past 4000 RPM | Main jet too small or fuel filter restricted | Upsize main jet by 2 sizes, replace filter |

It dissolves the diaphragm rubber and the plastic vacuum piston guide rings.