just thinking out loud...
It could it be that the main jet is partially coated? I have a few carburetors where the main jet would have a wax like substance in them, coating the walls of the jet. This would cause the engine to hunt until thoroughly warmed. A thorough cleaning of the jet usually fixes the problem. At least that what happening some the EPA compliant engines here. Even had to resize main jet to the next size on a couple.
Last edited by AVB; 09/08/15 04:39 PM.
