"Break-In".......
I believe it's safe to say that "break-in", is not what the term meant several years ago.
Let me try and keep this short......I know, I do nothing short, but I will this time.
Have you ever heard the term "case hardened"? This is basically what's taking place in the first 10 hours. These engines are newly built engines. There not something tried and tested for several hundred hours, then sold to you as new.
When you blend the throttle in a wide range, your changing the heating values of all the metal components. In hardening metal, it's heated up then cooled in oil. The theory in the engine is the same. By heating it up and cooling it off, changing the temperature range, the oils temperature and heating properties change too, thus hardening all the components of the engine allowing them to all flex, expand and twist together at the same time, as these newer generation of engines built today, have some of the highest torque value to engine displacement ever built.
I'd just be happy that someone built you a nice and fast toy, do as they ask so it brings you years of fun.
In the meantime, the next generation of jet ski engines will be even faster. With the addition of the 2012 model TRX's and TRT's, the new 440 hp, after burning, gas turbine engines will hit speeds in excess of 140 mph. The rider will have special gear that comes with the craft, like the "quick deploy" parachute in the event you fall off and the autonomous maneuvering of the craft as it comes back to pick you up, locating you essentially by the "homing" beacon of the safety lanyard you have strapped to your wrist.
Now, don't you all start emailing about that PWC just yet.........I'm only kidding!..........but wouldn't it be so cool!...................:cheers: