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Merc carb has a tiny hole after throttle fly.

Q

qhn

Regular Contributor
Ran into some Merc carbs before my time. '63-'67 and it has a tiny hole on the body of the carb right before the mount hole of the carb. Is this normal? I've seen a couple that had the same hole...
Racerone?
Thanks in advance.
 
That's there to overcome a bog when the throttle is cracked. Later on, they drilled holes in the butterfly itself; and such holes work. I cured the bogging of my triples by simply (once I figured it all out) drilling the existing holes larger.

The idea is to let more air flow through the carb, drawing in fuel, to overcome a temporary lean condition when the throttle is suddenly opened. Car carbs use an accelerator pump for this function.

Jeff
 
Thank you Jeff and many thanks also to Racerone for your attention. I don't run into this kind of carbs a lot. My customer's motor's carb has a hole so I was dazed. I know right away it flooded. I didn't want to have anything to do with this type of cracked carb and a hole so I went to a gentleman who owns a marine dealership and picked up a used carb from him. Amazing this carb also has the same type hole in which I know it's not original. So it's a quick fix by someone as Jeff mentioned. Anyways, the carb works...there's just a leak between 2 blocks....I I only charge the customer the parts, no labor...Now and then I have time and thought about these '67 Merc 9.8hp carb...I am still smiling to myself! Yes, I do drill the fly for quick fix, but not the body of the carb!!!
 
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