dla4567
Well-Known Member
My outboard carbs have check balls in the diaphragms. The secondaries never open regardless of which diaphragm spring. I've looked at others and they don't have the check balls and work fine. When I remove the check balls the secondaries open waaaay to soon. I suspect that the carbs with the check balls have smaller kill bleeds to create a greater vacuum around the restrictive check balls. I've put some grooves on the seat to allow some more vacuum to the diaphragms with good results but I don't feel this is the best solution. Does anyone know the correct kill bleed size or if there are different sizes? My carbs are the correct ones for 1970 440, and the kill bleed size is .046". From what little I remember this seems small. Also wondering when this check ball thing started and if any originally came with check balls? When I mention the check balls to some of the guys that have been running six packs for years they look at me like I've got 2 heads.