It warmed up today so installed the carb on the engine. After it warmed up I got the engine to idle real good. But when I advanced the throttle to fast idle or higher the engine will start to miss and stall. If I close the choke to about 90-95% it runs OK. So the fuel mixture is too lean. Same problem as before with the original carb. The fuel level in the sight glass stays right on the dot during this time so the carb is not starved for fuel, I'm at a loss. I could install a larger primary main jet and see what happens.