Standard two valve, air-cooled, 900cc, Ducati V or"L" twin engine, as used throughout many models. The initial model was taken from 3dcadbrowser.com from an unknown author, however I have replaced most of it due to inaccuracies and lack of detail. I got tired of wanting a highly detailed Ducati engine and being unable to find measurements anywhere, so I have spent a lot of time to make this as accurate as possible. No internals, however the cam belts, pulleys and guides are there if you suppress or hide the cover. I hope you enjoy it, and design many cool things around it!