Inspect rubber intake manifolds for cracks; spray carb cleaner around boots to test for leaks.
Use a digital caliper or a specialized float gauge to measure the distance from the gasket mating surface (without the gasket installed) to the highest point of the float.
Spray the exterior with aerosol carburetor cleaner to prevent dirt from entering the internal circuits during disassembly. Step 2: Diaphragm Inspection (Top Section) mikuni bs26 carburetor manual verified
The following specs are for the standard BS26/BDS26 series. Note that factory settings may vary slightly by specific motorcycle model. Specification Main Jet #90 (Standard Front), #87.5 (Standard Rear) Pilot Jet #17.5 to #20 Idle RPM 1,450 – 1,550 RPM Float Height 6.2 mm – 8.2 mm (US/Australia Seca II) Fuel Level 4 mm – 6 mm below float chamber line 📏 Float Level Adjustment
Common issues with the Mikuni BS26 carburetor include: Inspect rubber intake manifolds for cracks; spray carb
A common baseline is 1.5 to 2.0 turns out from a lightly seated position. Maintenance & Service Procedures
Hold the rubber diaphragm up to a bright light. Gently stretch the edges to look for pinholes, tears, or stiffness. If any cracks or holes are found, the diaphragm must be replaced; otherwise, the slide will not lift properly under load. Step 2: Diaphragm Inspection (Top Section) The following
Finally, he found it: a grainy but official PDF from Mikuni American Corporation . It was the "Verified Service Manual" for the BS series. The Restoration
The BS26 is a 4-stroke carburetor. Its 26mm venturi diameter makes it perfect for 125cc to 250cc single-cylinder engines found in motorcycles and scooters from manufacturers like Suzuki, Aprilia, Kawasaki, and Peugeot.
Connected directly to your throttle cable. Controls airflow entering the engine intake manifold.