Weve had several issues in the beginning with Go carbs. I email Russ and he found a similar issue. This was his reply

"I have kept my eye out for the carb problem you mentioned, I recently had a customer who could not get his engine to work right at all and it seemed to lean bog or show signs of an air leak after everything was sealed properly. The customer sent the engine back to me and i pressure tested the car (new style carb) it seems that the seam where the alumn. butts into the plastic carb body was leaking seriously. I sealed it up with something we have over here called jb weld, any carb sealer should do. pressure tested the carb again and there was no air leaking anywhere with the carb. I put the engine in my buggy and took it to a parking lot to get a tune on it. The engine was way off tune but when i got it in tune it was running great, idling very consistent and running very strong. I don't know if this is your problem as well but it is definately worth looking into.

To pressure test the carb i took it off the engine and got some new fuel tubing i then attached the fuel tubing and placed my fingers over the main carb openings and dunked the carb under water. I then blew into the fuel tubing and looked for air bubbles. I think this would be worth a try for you guys to test with the new carb hopefully it will solve all the problems that you have had with it. Let me know how it goes for you. talk to you later.

Russell
Racefactor Industries