hi Bill, i have a neighbour with an early rotax in a homemade monocoque chassis.... he reckons the engine is bullet proof... same engine as bmw used for a while i believe.
#1 Son has a morini 3 1/2 sport .... now, with the morini the thing is to get one in good nick, or at least complete ... spares can still be got... but from italy...if everything is working ok, then the one thing you must do is change the cam belt, easy job, my son does his bi-annually ....
i've had so much fun on that little morini, such sweet handling, run rings round almost anything on twisties ...