I put a Chinese knockoff on my 89 and the initial results were better than I expected. After about 400 miles the bike has started to burp as I’m just picking up the throttle or just rolling off. Maybe hiccuping is a better way to describe it. Will adjusting the air/fuel mixture screw help, or is it more likely it needs a different jet, or something else? The knockoff is a clone of the newer style carb. I appreciate any advice. I’d like to resolve this before it takes its winter nap. Cheers.