Just a tip - I had that same motor grenade on me because of a $50 oil sensor in the on motor oil tank. I don't know if it's common or not, but I beleive you can test it by moving the float in the tank while the engine is running and it should sound a low oil alarm. Might be worth a look.
Otherwise that was one of the better 2 stroke motors I've ran.
I know in the past they've had some problems with the pump not mixing the oil and your motor blows up! On one of my old boats I disconnected the pump and mixed my oil with the gasoline. My mechanic told me it's not a question of failure but when it will fail. Now I keep the reservoir full every trip and I pray the pump doesn't go out!
Not to go too far off topic on the oil level sensor: Mine stuck in the low position, so the alarm kept going off (and power was cut) even though we knew we had plenty of oil. What I found is that the shaft that the float ring slides on can become a bit gunked up. It is very easy to pull the assembly out of the tank and clean the shaft. This really should be checked a few times per year just to be safe. The tank is not the main large capacity tank, but the smaller tank mounted on the Port side top of the motor - under the cowling.