On Wed, 8 Aug 2018 00:09:33 -0700 (PDT), harry
wrote:

snip

Crap in the fuel tank

How often should we do that? boom tish ;-)

/damaged/disintegrating/missing fuel filters can lodge in the float valve seats so causing leakage.

True.

Fuel filter usually attached to fuel shutoff tap inside tank.

Except this setup has a remote tap (so no tap fitted to the tank
itself) and unless there is a filter inside the tap, there isn't one
on there. We have spoken of fitting one but they can cause issues
themselves (I fitted two on my BMW motorbike and had to remove them on
the first trip).


When I was a teenager we used to grind float valves in if they leaked.

These are rubber tipped so again, not possible in this instance.
However, they are brand new (carb service kit).

It's very frustrating.

A float valve is the most basic of mechanical systems and on the
bench, everything about these look perfect.

Further, with the basic 'blow into the fuel line and test the float
valves the right way up and upside down (so the valves only being
closed by the weight of the floats and jets) seem to demonstrate the
things as working perfectly? Operating the floats manually whilst sat
on the bike (with the float bowls off) also demonstrates they are
working perfectly?

So it's looking like the (hollow plastic) floats aren't working
properly when they are expected to 'float' (in petrol) but they don't
appear to be punctured or cracked or have taken on any fuel (and at 8g
weigh exactly the same).

Cheers, T i m