Seems to be a common occurrence among this class of aircraft!
Met a guy one time who had experienced 7 engine failures (resulting in off airfield landings) in his Rotax powered single seater!
The day I met him he had just installed a new engine in the aircraft and guess what? You guessed it, an engine failure on it's maiden flight! He sold the aircraft later that week to another 'enthusiast' at the field...
I am seriously considering the purchase of a LSA, but will probably go for something with a four stroke motor!