Some comments from Anders Karlsson

Yesterday I used your execelent pages for adjusting ones
SU-carburettors.  I have a 67' 420G with three of them.

On all three I had at least one of the problems you describe on your
page.  With your good instructions it was easily fixed.

However I found two more interessting faults on my floatchamber
arragements.  I thought I'l share them with you in case you think they
will fit into your web-page.

The first thing was that the fork, in one of the chambers, at first
seemed to move nicely upp and down but was in need of a bit of your
recommended adjustment.  But before doing anything with it I suddenly
noticed that now and then it would get stuck in the upplifted end and
would not fall down by itself as it should.  Closer inspection gave that
it was caused by the hinge beeing just a little bit to wide to fit in
between the two aluminium cast notches.  So with the small pliers and
the fork taken of anyway it was also easy fix.  

Now the next problem.  After I had adjusted all the floatchambers and
beeing confident that all the mecanisms was working ok I reasembled it
all and turned the key to see if the flooding had gone its way.  No
cigar! Still, the no 2 carb made an instant flood! Even worse than
before. Disassemble, inspection, no clue, reassmble, flooding,
disassable, still no clue. Think, think, think. The mecanism must be
working. What on earth could then cause the flooding?  But then I
suddenly got it - the only explanation must be that the overflow pipe
is blocked, leting no air out and causing the float to stay way down in
the chamber and never cuting of the incoming fuel.  And yes, while
assembling the floatchambers I must have pointed the end of the
overflow pipe right down into the dark bottom of the engine bay and
pressed it full of oil soaked grit effectively blocking it.

Just my 5 öre worth of experience.

        -- Anders Karlsson

Contact Alastair Reynolds 

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