Well, I'm at a loss now. I have tried the leaner needles and it was clearly running lean but I still had the same symptoms that made me believe it was rich. In the meantime I have swapped the carb, reeds and coil, none of which made any difference to the misfire. The power valve is operating properly and there are no signs of issues with the crank seals. What I have noticed is the plug always looks way too clean. This has been in for about 5hrs.
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