The Yammy is my next boat. I have a Seadoo Speedster 150 with 215 HP.
It takes 5 minutes or less to winterize. Mine has a closed loop (antifreeze) cooling system.
I just need to get antifreeze into the intercooler with a bilge pump in a pail of propylene glycol.
The nice thing with the Yamaha is that there is an access to the pump from inside the boat to clean out weeds. I’ve had to dive under my boat to do this a few times.
This is me last Sunday. This thing runs all day on 10 gallons.