Alex,
I had some similar problems. I did not use NGK plugs, but that is probably a
good idea! I had a noticeable misfire. I checked everything. I had new
wires (copper core), new cap, new plugs, new coil, new points, rotor, new
condenser and it still did it. I changed the rotor again just to be sure. No
good.
I tuned the carbs really well. Not too lean, not too rich. Still a misfire
I installed a Pertronix. No change, though the timing has less jitter back
and forth when using a timing light.
I adjusted the timing, and I found something there. Not with the timing,
though. As I tightened the retaining clamp after I was done adjusting, I
pushed a sparkplug wire sideways in the cap and got a BIG shock. The stock
style caps with the ignition wire getting speared by a set screw is just a bad
design.
I got a cap for a 1970 MGB (uses modern push-in wires), and some magnecore
wires (They do sell them for the TR2-4a), and THAT fixed it up. The car runs
really really well. I would advise that you get the epush-in style cap and
good ignition wires to fit it.
Then DO fix the mixture. It is not true that "they all run rich". At least
it should not be. I found that RL needles on the stock TR4A w/ HS6 carbs were
just right. They are about 5% richer than the stock TW needles. The SM
needles are richer than the RL. SM's would be too rich for my car, but maybe
just right for one with a mild cam.
-Tony
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