Paul -
If your BN4 has the 12 port head, check the casting plug on the back
of the intake manifold (the part facing the bulkhead).
Sometimes if you get a strong pre-fire, it will cause the plug to
dislodge slightly and create a vacuum leak. It can be very hard to
see, you have to feel it with your hand - the plug is convex in shape
with no lip. Feel around the circumference and if one side is poking
out, that is your problem.
Alan
On 6/29/10, Paul Leeks <Paull@glasgows.co.uk> wrote:
> After having problems with the poor running of my BN4, I put an electronic
> ignition in the distributer (which was also overhauled) and rebuilt the
> carbs
> using a carb kit. However, I still can't seem to get any power.
>
>
>
> I am pretty certain that the timing is right (having checked it with a
> timing
> gun), all the electric connections (plugs, cables, etc.) seem to be sound
> and
> I cannot identify any specific problems with the carbs (ie leaks around the
> inlet manifold, etc.).
>
>
>
> So I think the trouble is with the setting of the carbs, but I have been up
> and down the adjustment nuts (rich to lean and back again) without any
> success.
>
>
>
> The symptoms are ... a smooth idle, smooth but very sluggish pick-up on
> acceleration accompanied by a loud machine-gun type rat-ta-tat-tat!
>
>
>
> Any ideas?
>
>
>
> Thanks
>
>
>
> Paul Leeks
>
> Lancashire
>
> 100/6 BN4
>
>
>
> Glasgows
> Customs House, Customs Way, Preston, Lancashire, PR2 2UW
>
> Tel: 01772 767505 Fax: 01772 767566
> Email: paull@glasgows.co.uk <mailto:paull@paull@glasgows.co.uk>
>
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