Replacing Needle Seat
IMPORTANT.. for those of you with early Bing 64 carbs, (equipped with solid steel-tipped 4 sided float needles), the diameter of the needle seat is different from the later units. You must use a 7mm tap and bolt rather than the 8mm specified above for the later carbs. And NO, a 5/16" tap for these earlier carbs will absolute be too large and result in destroying the seat opening.
Additionally, rather than just screwing the bolt into the seat to pull it out (which forces the seat to turn in its cavity during extraction, possibly abrading the cavity), I recommend using a secondary nut on the bolt to prevent seat rotation.
I have documented this approach with photos on my own blog:
Replace Bing Carburetor Float Needle Seat – auldridge.org
Last edited by texcarguy; 22 Nov 2019 at 04:29.
Reason: photo
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