Bought a new huasheng carb to replace defective one. Now it produces even more wicked backfire. How do i "Adjust the jet"?

[darwin]

Ace hardware carry's keyway stock if ever needed.

 

[Chainlube]

(i might not know what im talking about here) Gasbike.net sent me a keyway that wouldnt fit the shaft. Contacted them about a proper fitting replacement and they ignored me. So i sanded it down best i could to make it fit and shoved it in..with a hammer... Didn't know it being lop sided could result in backfire.

If your key is leaning to one side a bit, turn your engine over and whichever way it turns put the lean of the key in that direction, this will advance your timing a tad. Which is a good thing.