An update,
While pulling the carbs for the umptheenth time I noticed some writing on the end of the rubber boot that connects the left side cylinder head to the carb. It said “Head”. I checked the boot on the right side and it said “Carb”. Hmm! Why are they different? Well they seem to be tapered with a bigger hole at the carb end tapering to a smaller hole at the head end. I pulled them both and re-installed both of them with the “Head” end towards the cylinder head and the “Carb” end pointed toward the carbs. Seems that all my mid range and top end problems have now disappeared! Every day I seem to learn something new?
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