I forgot to mention what John just added. The reason for his strong words is running up an engine on the beach is a sure fire way to throw a rod. Some people may say "that's never happened to me", but I can say it has happened to me. I let someone do it with one of my engines years ago, even though I thought it was a bad idea. It survived the tuning, but the engine threw the rod 3/4 of the way around the course.