My slant six equipped Scamp does the same thing. I think it is due to it boiling the fuel when it sits after it is fully warmed up but I'm not sure. My Barracuda with a 440 does not have this problem. My former Barracuda with a 318, which I had many years ago, would start up with a flick of the ignition switch, you didn't even have to give it any gas or even get in the car if it was warmed up.