Mikuni BDST Carburettors - Replacement of Pilot Merge Chamber O-Ring


Vacuum O-Ring The easiest way to remove the bungs is to make a tool that fits inside and use that to wiggle them out. An old screwdriver or 6mm rod can be used and just file the flat to fit the bung. Vacuum O-Ring Remove the merge cavity bung.
Vacuum O-Ring
Clean the cavity and blow compressed air through all orifices.
Vacuum O-Ring Lubricate the new o-ring with some rubber or silicone grease. Just enough to make it glossy.
Note: This o-ring is not shown in parts books, nor is it included in other carb kits.
Vacuum O-Ring Then align the flat on the bung with that in the cavity and press home with your fingers.