Re: Jetski dry start
i have yet to see a jet ski that will be damaged by running out of water for a short time. (30 seconds, max of minute if idling)
As others mentioned, no impeller, no water pump. The damage will come from overheating the exhaust, engine, or shaft seals. None of those are issues if done for a short time only.
In fact, it is specifically recommended in the manual to blow out water with a couple short bursts of throttle after loading.
it isn't just jet skis, most jet boats are going to be the same. My current boat has a 2.5l v6 mercury engine, identical to the outboard version, EXCEPT there is no waterpump. There are some holes in the wear ring around the drive impeller that creates a nice high pressure area. Running without water for a short time is not a problem.