How about trying plugs with a different heat range?
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>
> Date: Mon, 31 Oct 1994 18:00:31 +0000 (GMT)
> From: asj@dsbc.icl.co.uk (Adrian Jefferies)
> Subject: mysterious mixtures
>
> hi
>
> My TR4 tends to foul its plugs with the well known sooty mixture; I've
> gradually leaned the mixture down over a long period until I got
> to the point whereby the car just wouldnt pull at all. The engine runs
> just fine & happily starts every time. I'm using unleaded fuel as the
> engine got a head rebuild & hardened valve seats a couple of years ago.
>
> I can get the power back by richening the mix a tad, but have
> to clean the plugs every few hundred miles. The carbs are SUs and
> respond to fiddling exactly as per the book, idle is about 900, ignition
> is bit retarded to alleviate pinking/pinging.
>
> So, brave Scions, are "weaker needles" the solution?
>
> Regards, Adrian & TR4
> asj@dsbc.icl.co.uk
>
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