Definitely check the float level, check the needle valve assembly for
wear or dirt and verify that the float is not saturated with fuel
(i.e. sinking rather than floating.) Any one of these could cause
excess fuel to flow into the engine.
HTH,
Donald.
> From: david@robertson.org.nz
> Date: Sun, 23 Mar 2003 15:26:12 +1200
>
> 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
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