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The sounds could be the injectors firing not the shafts rattling, but I can't hear it to tell you which. When I use the Twinmax, I dial down the pulses so I get a better reading & also hold at 4k instead of 3k. What weird readings did you get as mine stays pretty even all up & down the rev range. Idle is set with the air screws balanced & upper revs with the right cable, I never change the left cable as long as the throttle plate close fully, which it always has. As for temps I have no idea if they're the same or not as I never measured them, but if one side is hotter, I would assume it's leaner. This should all be done with the valves checked & adjusted first.
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