Mikuni Bds26 Service Manual Extra Quality
Having the correct tools prevents stripped brass jets and damaged soft aluminum bodies.
Never soak rubber diaphragms, O-rings, or plastic floats in harsh solvents.
Flip the carburetor upside down. Remove the four screws holding the float bowl.
Install new pilot and main jets if your rebuild kit includes them.
Must include a high-quality float seat, needle, bowl gasket, and fresh O-rings. mikuni bds26 service manual
If your bike has been sitting for a long time, a full rebuild is the only solution. While there is no official "Mikuni only" step-by-step, here is the general procedure used by mechanics:
Measure the distance from the gasket mating surface (without the gasket) to the top of the float.
| Specification | Value / Detail | | :--- | :--- | | | 26mm | | Float Height (Dry/Bench) | 6.2mm to 8.2mm (0.24" to 0.32") | | Standard Main Jet (Seca II) | 102.5 (N100-604 series) | | Standard Main Jet (125cc) | 90 (004-281 series) | | Standard Pilot Jet (Seca II) | 17.5 | | Spark Plug Gap | 0.6–0.7 mm (NGK CR6HSA / CR7HSA) | | Fuel System Type | Downdraft, CV-type with Accelerator Pump |
Hold the diaphragms up to a light source. Check for pinholes or tears. Any damage requires replacement. Having the correct tools prevents stripped brass jets
You can find specifications via sources like Scribd.
Remove the four screws on the bottom to access the float bowl.
Connects the main fuel line from the petcock/pump.
Invert the slide to remove the plastic needle retainer, spring, and the jet needle. Note the position of any tiny washers or e-clips. Step 3: Float Bowl and Fuel Control System Remove the four screws holding the float bowl
If your vehicle utilizes dual BDS26 units linked together, hook a vacuum gauge or manometer to the vacuum ports of both carburetors. Adjust the synchronization screw located on the connecting linkage until both gauges pull identical vacuum readings at idle. This eliminates engine vibration and balances power delivery across both cylinders.
This article serves as a comprehensive guide based on the and industry best practices, covering everything from routine cleaning to a full rebuild. 1. Understanding the Mikuni BDS26
By following this guide, you can successfully clean and rebuild your Mikuni BDS26 carburetors, restoring your vehicle's performance.
Gently lift the rubber diaphragm to pull out the throttle slide and jet needle.
Check for deep scoring on the plastic or metal slide surfaces. The slide must drop smoothly in its bore under its own weight.