19-08-2022, 07:38 AM
Andy, I had a very similar situation to you which I posted in this thread: Zenith 26VA differences
In my case, the differences weren't so subtle. One float bowl has a completely flat bottom. Also, as on yours, one set of attaching bolts is hexagonal and the other square.
I was pointed to the answer, quite likely the one you remember, here: Carburettor problems.
However, here's the nub of the matter, the combination that works best for me is a mismatched one! When I attach the bowl that is supposed to fit the idling cannot be lowered to a sensible speed but with the "wrong" bowl it runs sweetly - the exact opposite of expectation. I have been running that way for a few weeks and all seems well.
In my case, the differences weren't so subtle. One float bowl has a completely flat bottom. Also, as on yours, one set of attaching bolts is hexagonal and the other square.
I was pointed to the answer, quite likely the one you remember, here: Carburettor problems.
However, here's the nub of the matter, the combination that works best for me is a mismatched one! When I attach the bowl that is supposed to fit the idling cannot be lowered to a sensible speed but with the "wrong" bowl it runs sweetly - the exact opposite of expectation. I have been running that way for a few weeks and all seems well.