ZDZ's will spit out gas. There are two solutions. The first is to put on a velocity stack to improve air flow into the carb. The second is to install an airfilter which not only improves air flow but the gas gets caught on the mesh of the filter if it gets that far and is sucked back in. (both available from RC Showcase for $20-$40) Gas in the area behind the engine is very dangerous and should not be allowed to continue.

Gerry Rosebery