Doodling up a decent legal UL has been a backburner project for me for years. My engine choice has always been the MZ201. 45hp, belt reduction, free air cooling and under 70lbs. Great engine but now the company appears to be owned by a Chinese company. Haven't had any word about delivery, service and price or any other info about the new owners. Apart from my computer warning me not to go to their website! Which is silly. But apart from that engine I don't think there is anything that comes close to it as far as power to weight ratio goes and it has a decent pedigree. What else is out there under 80lbs and at least 40hp? Yes, I googled myself silly but maybe people out there have first hand experience with something suitable.