Contrary to what it says on the e-bay listing I was the original builder / owner of that engine.
This is a picture of the original bike
The engine you see in the picture is the MkI which spread its innards all over Elvington airfield. You would be amazed what a diet of 80% nitromethane can do when things go wrong. However, I rebuilt or more to the point replaced the engine as there wasn't a great deal salvageable from the MkI. The MkII engine is the one in the listing. Unfortunately there are a few bits missing. The crankshaft that's in it came from the MkI which unfortunately did suffer some damage in the blow up and one of the big end journals has a grove in it courtesy of the rod breaking. Oh. by the way three of the rods broke and went through the cases in the original. As I have suggested large doses of nitro = potential mechanical carnage and in my case it did! However, I did have the crank professionally crack tested and refurbished, so despite the damage to one of the big ends it should (in theory) be OK. I hasten to add that I have spoken to the current vendor and he is aware of this.
Cheers
Eric