Thanks fixitstan and Favs. I checked the two outputs from the ecu with an oscilloscope today and have nice clean pulses. Nice to actually see the 270 degree spark pattern.
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The carbs came off again today and I found that one of the new cold start plungers had a damp patch of fuel around it. And the brass fuel tube on the side of the carb had some locktite around it that had cracked and come loose. So, maybe some clues. Sealed the tube and put heat shrink on cold start plunger shaft to get a better fit in the o ring / grommet. Maybe....Â
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Just got to find enough sanity to put carbs back on again. And again........  Â
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The carbs came off again today and I found that one of the new cold start plungers had a damp patch of fuel around it. And the brass fuel tube on the side of the carb had some locktite around it that had cracked and come loose. So, maybe some clues. Sealed the tube and put heat shrink on cold start plunger shaft to get a better fit in the o ring / grommet. Maybe....Â
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Just got to find enough sanity to put carbs back on again. And again........  Â