Remember and start it before turning water on. Turn water off before stopping too. All the best
What QBoy wrote should be in BOLD! I suggest adding a cheap lever garden hose shut off valve to your new fitting. That way, if it stalls, your not running like a lunatic to turn off the water.lol
You can run those easily for ~20 seconds without water.... We've had wayyy too many customers bring skis in that were full of water.
Also, replace the cap on the flush port. Yamaha makes very reliable ski's and the venture was a good one.
Good luck!