|Mikuni BST40 Flat Slide Carburetor Diaphragm replacement instructions.
|Remove the old plastic retainer from the
throttle slide with sharp knife as shown.
Plastic retainers warp and leak with age.
|Use a 1/8" drill to open the holes slightly to fit
the rivets. Air filter side of slide shown. Use
aluminum rivets only.
|Be sure the spring guide stud
is not bent and the spring
does not rub on the hole in the
diaphragm or slide.
|A mark of paint can make
it easy to get the slide
back in facing correctly in