Oh no, Dave, don't you know the word "carburetor" is French for "leave it
well enough alone =8O
Just kidding. Do you really still have the original OPUS ignition? Most
of those things have long since gone into permanent failure mode. Maybe
you've just been lucky--up to now.
Have you checked the condition of the spark? There should be a good,
clean blue white spark, capable of jumping a good quarter-inch.
Especially with the Sport Coil installed properly. And yes, you'll need
to by-pass the ballast resistor wire (pink/white) that's bundled into the
harness. The easiest was is to run another white wire to the "+" coil
terminal from a switched 12v. source. What you want to end up with is
12v. available to that terminal when the ignition switch is in both the
"Start" and "On" position.
Back to the original problem. Did the engine start running poorly as soon
as you started turning the mixture adjusting nuts. How many flats did you
turn them. Is it possible you accidently loosened the nut that locks the
jet centralization? Check to see if the pistons lift and fall easily.
Assuming you did turn just the adjusting nuts, and only a few flats. I'm
guessing it's coincidence and you should check the spark.
Keep us posted,
> I couldn't leave well enought alone and decided to try to get my 78 Spitfire
> to run a little better. The car has a set of dual SU HS2, all I wanted to do
> was to adjust the mixture setting. It was running pretty good but just a
> too rich. Is started to adjust the mixture and it started to miss, things
> kept on getting worst and worst. I give up and changed to a new set of plugs,
> that got the car to running without any miss. So, I continue to adjust the
> carbs somemore and the same thing happen.
> After about 1 hour of trying to get the car to run without miss I gave up. I
> figure there must be something that was on the edge of failure and this pushed
> it over. Now, I have a new set of wires, rotor, dist. cap and a Lucas Sports
> coil. I thought it was the coil going on me but with all these new parts
> the car still run very rought and it is not running on all cylinders. Does
> anyone have any idea what might be wrong. I didn't touch the timming but
> while I was waiting for the parts I adjusted the valves. Any suggestion
> will be very welcome.
> Help me please :(.