The official Mikuni BDS26 service manual has a dedicated troubleshooting matrix. Here are the highlights:
| 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 | mikuni bds26 service manual
The BDS26 requires mechanical and vacuum synchronization: The official Mikuni BDS26 service manual has a
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