I agree...
sorry to hear about your loss... but the 720 engine really is bullet proof if it was built right to begin with. I just popped one out of a 95 XP, and it still runs.
I'm not sure who PMC is... but if you only have 6 hours on it... I would be calling them for a refund. Also... the center gears should not give out unless they were run without oil.
On that thought... did you go to pre-mix, or are you still running the oil injection?
You could swap in a different engine... but nothing will be easy.
One thing to think about... you could probably buy an ugly mid 90's ski with a running 720 engine. Put it in your boat... and part out the rest of the ski, and probably turn a profit. The 95 XP I had... I kept the engine, and the trailer, and still got $300 more than I paid for it after all the parts were sold.
I do strongly :agree: with Tony on this. The 717cc engine was one of the most user friendly engines Rotax developed. It was the most horsepower in their first design of the 2 stroke motor before adding the balance shaft of the 787cc and the 951cc.
I don't think the problem is the motor. Like Tony, I have never heard of PMC either. I don't trust my rebuilds to anyone. I do them myself, or I get a remanu from someone like SBT. Even then, if you got an SBT engine, if you don't know why the motor blew the first time, find the root cause, you could blow the new one.
In most cases, if you burn up one engine, then burn up another, the problem is in one of the subcomponent parts like a lean running carb or the injection pump not working properly.
A new remanu motor, or the one from PMC, if not broken in properly, can also blow. The biggest thing about a new motor is to add a little extra oil and vary the throttle often. Dont' leave it set at one RPM for no more than a few minutes before moving to another spot. Then, dont' hold it to WOT at anytime during the first tank of gas.
Just because you get a new motor, doesn't mean you can stick it in and just go. You have to set the rings, etc.. to burn the engine in right.
I'm not saying yours wasn't done right. From your descriptions, you sound like a pretty good mechanic. So, there must have been a root cause to this problem somewhere. If you were to just get another engine, it's likely it will happen again. You've got to figure out why the motor blew....:cheers:
