On Thu, 09 Aug 2018 10:46:02 +0100, "Dave Plowman (News)"
wrote:

In article ,
T i m wrote:
If not, and the
seat is part of the carb body, I'd be inclined to lap the valve to it.

Except, these bike valves are often rubber tipped and so you couldn't
really use the valve itself to do any lapping.

Ah - of course. Think those arrived on later SUs too. I'd guess the rubber
might wear or perish etc?

I think the classic failure mode for them is the develop a ridge where
they sit on the hole in the seat.

No chance of buying new?

New already fitted. ;-(

Cheers, T i m