I sure you've all ready spotted this one but if you haven't it's Ruggerini 2 cylinder in a generator for spares listing no 252393138039 , Could be a cheap engine as it has issues https://www.ebay.co.uk/itm/252393138039 .
Cheers Tim
Ruggerini Diesel engine eBay
Moderators: Dan J, Diesel Dave, Crazymanneil, Stuart