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Piston & Cylinder problems

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Hey guys hope every one is havin better luck than i am just bought my F-7 on friday dec 13 and went for a trip on saturday didn,t even get 2 miles and it lost all power twice so i changed the plugs 3 times and the third set seem to make it work better so away we went put about 100 miles on and then that is when it blew a chunk out of one piston and scuffed the other one really bad also took both cylinders out with it. I have 2 other buddies with F-7n as well and we took the exhaust off both of them and they are havin the same problem the pistons are scuffed all to hell and the worst thing is that pistons are on back order if u hear of what maybe causing this please let me know. Thanks