First step was dismantling which was quite hard as most of the parts were tight as a lock. The nut securing the fly wheel is reversed thread and the woodruff key holding both the flywheel and magneto on the crank must be removed from both sides before removal. The rest of the tear down is very straightforwards. Upon inspection I noticed the connecting rod and piston were both trashed as were all of the bearings. The primary chain is a duplex and needed to be replaced and I used http://www.sprocketsunlimited.com to get a new one. Buying all new SKF bearings for the engine (6203,6204 and one other size), engine gaskets from ebay.de, I began to put the engine together. With a bent connecting rod, I had to buy a used DBK 250 engine off ebay.de just to get the rod. The piston was shot so I had a new one made from http://www.oldtimer-ersatzteile-gk.de. The magneto was sent off to be tested but the shop could not test this type according to them so ordering a new contact from http://www.motorrad-stemler.de
The assembly was very straightforward, no tricks or issues along the way.
After bead blasting the engine cases.
