My R100GS cylinder head has now been expertly repaired by Roger Bennett Engineering of Huddersfield. The head has been welded to repair the crack and a new exhaust nut thread cut.

This is what the damage looked like before the repair.

Roger was also kind enough to take the valves out clean them and re-cut them back into the head, as he thought they needed doing. All this was included in a very reasonable price and the work was completed on time.

I would definitely recommend Roger Bennett for engineering work but hope not to be sending him any cylinder heads in the near future!