Kev I have seen that bike a couple of times and never noticed I will look closer when I see it again hopefully next month at West Hagbourne bike night.
I should remember but????? I think we used a yamaha 350 pump and then made a housing. It stuck out a long way and spoiled the look of the engine, but it was a one off with a printing dead line to meet so we had to go with it. The bike never came back to the factory after it was won even though we offered to do some more carb work on it.