Anybody know tap size for main nozzle on Walbro carb?

[coinman66]

I think I can salvage this carb. Boogered up threads on main nozzle in my Walbro 4993 carb. Briggs part # on carb is 799727. Just wanting to know tap size where brass emulsion tube goes.
THANKS!

 

[SeniorCitizen]

Can you measure the diameter of the threaded portion of the tube with a micrometer?

 

[coinman66]

Can you measure the diameter of the threaded portion of the tube with a micrometer?

Don't own a micrometer.

 

[reynoldston]

if you own a tap and die set run the nozzle through a die first just to get the size. don't be surprised if its a odd size.

 

[coinman66]

if you own a tap and die set run the nozzle through a die first just to get the size. don't be surprised if its a odd size.

Don't own a tap and die set.

 

[coinman66]

Wonder if I could contact Walbro techs and they could tell me?

 

[reynoldston]

Very hard to work without tools. Maybe bring the nozzle to a repair shop and they will check it out for you. I can't see them charging you very much or anything to run their tap for you. You can buy a cheap tap and die set from HF for around 10 dollars. They work fine for a home shop. get both sets SAE and metric

 

[ILENGINE]

Don't remember the size but it is an odd size not available in any tap and die set. Briggs has their own carb tap set for cleaning those threads, but I am not even sure it will fit the newer walbro carbs, because the set was originally used for the old briggs carbs used one their engines similar to the 8 horse side shaft, and the carb used on the vertical snapper rear engine mowers.

 

[reynoldston]

Don't remember the size but it is an odd size not available in any tap and die set. Briggs has their own carb tap set for cleaning those threads, but I am not even sure it will fit the newer walbro carbs, because the set was originally used for the old briggs carbs used one their engines similar to the 8 horse side shaft, and the carb used on the vertical snapper rear engine mowers.

Seeing its something I have never had a need for I never gave it any thought. I know in my own mine I was thinking odd sizes but didn't know for sure. Sure sounds like new carburetor time to me.

 

[coinman66]

Seeing its something I have never had a need for I never gave it any thought. I know in my own mine I was thinking odd sizes but didn't know for sure. Sure sounds like new carburetor time to me.

Nope gonna, gonna try and tap it and fix it. I won't give up without a fight!