[scicala]

"This lowering the primary float sounds like a good idea. It won't cost me anything to try it. What about a phoneolic spacer under the primary carb? Speedway sells em."

I thought the issue was with the front carb ? Not the primary carb ?
I wouldn't lower the float more than 1/32" below spec if you decide to do that. If fuel is boiling out of the carb, go for the phenolic spacers instead. Asking for other trouble by lowering the float level (band aid fix).

Sal