leaking carb Cub

[WayneMo]

I put a cheap kit on my cub and still leaks Most of the leakage is at the tubing inlet likely due to bad threads. I put the top half and the whole carb less the gasket in a tub of water and all I see is big leakage at the tube inlet,nothing else. My little compressor only puts out about 5 psi but once the air gets past the tube inlet, nothing. The carb admits air at the tube inlet when I blow by mouth as it should when I flip the carb over it seals. The kit does not allow me to set the float drop as it should and the float drop is very large, but otherwise the carb functions as it should when I blow air by mouth.
When I install the carb, gas pours out the tube inlet and strangely, it runs out the carb exit where the air hose connects. I guess when the carb is filling up, gas weeps onto the top surfaces near the tube inlet and out the carb mouth. It acts as though my problem is the tube inlet connection but I am not sure that is all. I will epoxy the tube inlet to fix that but the amount of gas weeping, especially at the carb mouth makes me dubious.
My air presure tests showed nothing once the air reached the needle and seat, likely due to the sudden drop in air pressure. My new needle is a viton tip. I will keep you advised as to my progress. I am not sure how gas flows on its way from the needle to the venturi and why it appears at the carb mouth. Also I would think gas should not normally reach the gasket before shut off by the needle.

 

[old]

Sounds like you may have a cracked carb upper part so gas leaks in even after the float closes the needle. You can buy a cheap after market carb on Amazon for around $35 and once you open it up and rill out a hole that didn't get drilled they work just fine. I have one on my Cub. When I got my cub it didn't have a carb

 

[BarnyardEngineering]

The threads on that inlet are often stripped, resulting in leaks. I JB welded a 5/16" compression fitting adapter from the hardware store into the inlet on a Cub carb I had once. It worked great.

 

[grandpa Love]

Unfortunately some carbs are beyond repair..... I've used a dozen of these, mainly on cubs I buy with carbs missing. Cnc machine broke a bit and the hole with red straw pointing at it didn't get drilled through. Very simple to do. Then those carbs need zero adjustments, just bolt and go.

 

[WayneMo]

Grandpalove reply did not come through. I wish he would send the photo again so I could save it.

 

[old]

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