Thanks Grumpy, that exhaust is my fault. The existing one was a broken off stub and I put that in just to have something to stop it blowing flames and wrecking my hearing. I'll put the correct one on as time permits.
As to the carb, I'll check out that manual and do some more googling to see what I can dig up. I actually hope that it is supposed to be there and it's just going to be a matter of getting the missing bits off it rather than trying to source a new unit. I'll start looking for an inlet manifold as well. I'm a bit puzzled as to why the guy would have changed it.
