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 the future. |
$29 each |