Yes, I think I am convincing myself to go premix and block off.
I really have worried about this since the first engine failure. I haven't been able to enjoy a day on the water as much always waiting for the next one to lock up. If i can eliminate one less worry, i will enjoy the hobby more.
Either way is fine. But like I said... don't get lazy and just pour your oil into the fuel tank. It will go to the bottom, and sit there. You need to pre-mix it into some fuel first. Also... don't get lazy with the measuring. It's real easy to get a tank of fuel that is too rich, or too lean.
One last thought on keeping the injection. OK... so you already know you need to keep the tank so your rotary gears stay oiled. But, in our engines... the rotary valve itself is lubed by the incoming oil. When you go to a pre-mix... the faces of the valve will no longer get the oil needed, and will wear out prematurely.
As I said before... I normally remove the injection from any used watercraft I buy... but on the Rotax engine, it really is an integrated part of the design. On my Yamaha's... it's just the injection, and serves no other use. (and they fail on those engines)
One word on your posted engine. I agree with Snipe. That wasn't an oil failure. These engines are high RPM... and they run at +85% all the time. Aluminum can only take so much stress, and eventually it... or the iron rings shatter.
An engine that fails from lack of oil, or a lean run will show melted/scared piston skirts, or roasted crank bearings. (normally the rod bearing on the crank)
