My D6 9U has had this conversion done. When I got it the engine was toast, it had thrown a rod... I bought a replacement engine which didn't have a pony engine on it. The bell housing on my original engine had the drain hole brazed shut so I converted the replacement bell housing to an electric start... The conversion process involved machining an opening for the starter. The pad for the starter was already there but it didn't have the holes or the threads for the bolts. I took it to a local machinist who put the holes and threads in the right places. The starter then just bolts right on. Where the pinion gear housing goes I just installed a plate. On the top where the pony engine was I also installed a plate with a gasket underneath to seal up the coolant port. On the top of the head I also put a plug where the coolant from the pony engine goes in. All in all a pretty simple conversion. Some guys put a battery tray on top of the plate where the pony used to be, on my machine there's a big battery box on the fender so I have open space there now. I think there are 2 types of starters available, a 6V and a 24V. Mine has the 24V, and I also have the 24V gear driven generator on the engine. I'm really happy with it, that D318 is a great engine! If you have any more questions don't hesitate to ask, I'll do my best to help you out!