In no particular order:
check the needles for damage - or that they are in fact the same needles
(if the carbs are of dubious origin)
check the needles are flat with the piston surface (check the haynes)
check that the floats are floating and that the level of the fuel should
be the same in each
James
1977 Pimento Red Spit
david@robertson.org.nz wrote:
>Hi,
>
>I've been trying to get my Mk IV Spitfire runnung a bit smoother. I've
>found the peoblem appears to be the rear carb (HS2 SU I think). It's
>running too rich - if I lift the piston with the little rod, the enging
>speeds up & smooths out noticably. However the mixture nut is already
>wound as far up as it will go. I took the piston out to have a look and
>the jet is way higher than the front one. The front one is about level
>with the bridge. I tried setting it the nut to two complete turns from
>tight (this is the starting position in the manual). It was hard to start,
>ran really rough with plenty of black smoke and wouldn't idle. I've put it
>back to being screwed all the way up but it's still not great.
>Any suggestions?
>
>Regards,
>David Robertson
>
> 1961 Thunderbird
> 1978 Triumph 2500S
> 1974 Triumph Spitfire
>
> <<< Life is too short to drive boring cars >>>
>
>http://www.robertson.org.nz/David1.htm
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