> 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?
Have you checked the actual fuel level for the rear carb ? A leaking float
valve will do this.
Not sure if this applies to HS2, but on an H2 the jet itself can wear if the
needle wasn't properly centered at some point. If nothing else helps, you
might try changing the jet.
Randall
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