Here is a pic of one. I have a couple of these Gannet 15cc marine engines. Total loss oiling, magneto, spark advance...circa 1958~1964, made in England.



These are not for sale, but thought LF might get a kick out of it.

As for the project...get some soft copper tubing and wrap around the cylinder of the engine, and circulate water via an electic fuel pump you power off the generator..might work, but hey! it's an experiment, right?? Best of luck.