Install the pilot jet and main jet. Ensure they are snug but not overtightened.
Bend the small metal tang on the float arm slightly to adjust. Re-measure until accurate. Installing Jets and Diaphragm
This comprehensive guide is designed to serve as a , covering the overhaul, adjustment, and troubleshooting of these common CV (Constant Velocity) carburetors.
If the measurement falls outside 12-13mm, carefully bend the small metal tang on the float arm to adjust it. Reassembly Instructions mikuni bds26 service manual
Use the drain screw at the bottom of the float bowl.
: Because it is a dual-carb setup, you must synchronize the throttle plates after any major service to ensure both cylinders are pulling equal vacuum For complete visual walkthroughs, you can find a Mikuni BDS26 Cleaning & Overhaul guide or full technical breakdowns in the ATKUSA Fuel System Manual specific adjustment steps for setting the float height or synchronizing the idle? Fuel System | ATKUSA
Reassembly is the reverse of disassembly, but requires strict attention to tolerances. Setting the Float Height Install the pilot jet and main jet
Carefully pull the rubber vacuum diaphragm and slide assembly straight up out of the carburetor body.
By following this guide, you can successfully clean and rebuild your Mikuni BDS26 carburetors, restoring your vehicle's performance.
Pay special attention to the tiny holes near the throttle butterfly valve. These are critical for a steady idle. Step 3: Inspection and Float Height Re-measure until accurate
Understanding the Mikuni BDS26 Carburetor The is a dual-body, downdraft constant velocity (CV) carburetor, most famously used as original equipment on motorcycles like the Yamaha Virago XV250 . Unlike direct-slide carburetors, the BDS26 uses atmospheric pressure differentials to move the throttle slide, providing smoother power delivery and better fuel economy for small-to-mid-sized engines. 1. Key Components and Function A standard service involves three primary systems:
Install the spring, place the top cap back over the assembly, and torque the screws evenly. Troubleshooting and Synchronization Diagnostics
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Remove the top chrome or black plastic vacuum caps. Keep pressure on the cap, as there is a long, compressed spring underneath. Lift out the spring and the plastic spring seat.