Hello all,
Well I'm embarrased to say that the problem was very simple. After
checking over the carbs and half the ignition system, I finally noticed
that the leads for the upper plugs on cylinders 2 and 4 were reversed.
The mechanic who did a 100 hr inspection, prior to the final inspection
for C of A, had rebundled much of the engine wiring and hoses to tidy it
up, and must have reversed the leads, and left them tied so they
naturally fell in that position, and so that the tags with the cylinder
numbers were not easily visible. Amazing that it ran so well !
I now have a mag drop of 75 rpm on both mags - feels much better.
Many thanks for all the help. I've learned a lot about the engine.
Regards,
Keith
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