Mikuni Bs26 Carburetor Manual Verified _best_ Jun 2026
Use a properly sized screwdriver to avoid stripping the brass. Remove the main jet, pilot jet, and needle seat.
Before making modifications, baseline your carburetor using the verified factory specifications. While specific jetting varies slightly by vehicle manufacturer (such as Suzuki or Yamaha), standard baseline values provide a reliable starting point. Factory Specification / Measurement Main Jet (Stock) #110 to #132.5 (Application dependent) Pilot Jet (Stock) #15 to #22.5 Pilot Air Screw 1.5 to 2.25 turns out from lightly seated Float Height 17.1 mm ± 1.0 mm (Measured from gasket surface) Fuel Level 4.0 mm ± 0.5 mm below the bowl mating surface Idle Speed 1,300 – 1,500 RPM (Typical engine baseline) 2. Component Diagram and Anatomy
Turn the pilot mixture screw clockwise until it seats lightly. Back it out to the factory setting you recorded during disassembly, or use 2 full turns out as a baseline. Idle Synchronization mikuni bs26 carburetor manual verified
Use the idle thumb screw to drop the idle back down to factory specification (typically 1,400 RPM). Resolving Mid-Range Lean or Rich Conditions
Push the small pin retaining the float hinge out with a needle or punch. Lift the float out along with the dangling needle valve. Use a properly sized screwdriver to avoid stripping
By using the outlined in this article—float height of 13.0mm, pilot screw at 2.5 turns, legitimate OEM diaphragms, and a stock air box—your BS26 will start on the first choke pull in freezing weather and idle like a sewing machine.
With the manual propped open on his tablet, Elias went to work: Back it out to the factory setting you
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If you want to troubleshoot a specific issue with your Mikuni BS26, I can provide the exact steps. Please let me know: The of your vehicle
Locate the fuel mixture screw on the side or bottom of the body. Gently turn it clockwise until it lightly seats, counting the exact number of half-turns. Write this number down. Back the screw completely out. Use a dental pick to retrieve the spring, small metal washer, and rubber O-ring hidden inside the passage. Cleaning and Inspection Protocol Do not submerge rubber parts in harsh solvents.
Tap the side of the bowl with a plastic mallet to break the gasket seal. Lift the bowl straight up.
