Mikuni — Bs26 Carburetor Manual Verified

| Parameter | Spec | |-----------|------| | Type | Constant Velocity (CV), downdraft | | Bore size | 26 mm | | Venturi diameter | 24.5 mm (effective) | | Fuel inlet | 5/16" (8mm) barb | | Float bowl gasket | Rubber (O-ring type) | | Pilot air jet | 120–130 (varies by model) | | Main air jet | 180–200 | | Idle speed | 1,200–1,300 RPM |

Where to download a verified PDF:

| Symptom | Likely cause | Verified fix | |---------|--------------|---------------| | Idles but dies on throttle | Clogged pilot jet | Remove jet, hold to light – must see perfect circle. Clean with #75 guitar string or torch tip cleaner (never drill). | | Hesitation at 1/4 throttle | Torn diaphragm | Replace only genuine Mikuni. Aftermarket "BS26" diaphragms are often too stiff. | | Rich black smoke | Float height too low | Reset to 13.5mm. Also check needle jet wear (oval-shaped hole). | | Hard cold start | Enricher (choke) circuit clogged | Remove brass plunger, spray carb cleaner through the two small holes in carb throat. | | Fuel leak from overflow | Dirty float needle or worn seat | Replace needle & seat set (Mikuni VM28/486). Do not lap the seat – it's plated. | mikuni bs26 carburetor manual verified

Per the Suzuki GS500 Service Manual, section 4-7: | Parameter | Spec | |-----------|------| | Type

Float height check:

Diaphragm inspection:

Jet identification: | Circuit | Typical BS26 range | GS500 (1996–2000) | |---------|-------------------|--------------------| | Pilot jet | 35 – 45 | 37.5 | | Main jet | 120 – 140 | 125 | | Pilot air jet | 80 – 120 | 95 | | Needle clip position | Groove 1–5 | 3rd from top | Where to download a verified PDF: