Mikuni Bds26 Service Manual Official

Check the needle valve tip. If it has a visible ring or groove, it won’t seal properly, leading to a leaking carb.

Always use new O-rings on the pilot screw and fuel joint pipes. mikuni bds26 service manual

Spray carb cleaner through every hole in the carb body. You should see fluid exiting from another hole. If not, it’s blocked. Check the needle valve tip

Push out the hinge pin and lift the float and the attached needle valve. it won’t seal properly

During assembly, ensure the slide housing o-ring is seated correctly. Because the recess is shallow, some builders use a fuel-resistant gasket cement like Permatex #85420 to keep it in place.