Did you know that these days the four stroke Skis are capable of doing thousands of hours. Many of them are fuel injected and this means they are going to get some form of blockage sooner or later.
Believe it or not the most prone Skis are those that are only used occasionally. The ones that sit for 6 months of the year and then do a few hours over summer.
If you use them every weekend then it’s not a likely problem however we do all our Skis at 200 hour intervals.
This can easily be done at your next Jet Ski Service or in between. It’s certainly cheap insurance from melting a piston and is not on standard service schedules!