I?d be guessing incorrectly pressed crank webs. Especially if it has had a recent rebuild. Stick a dial gauge on the end of the crank and check the runout. I recently pressed one together and the owner said it was never that smooth from new.
P.s 2 stroke do vibrate but never enough to make fingers numb, so something is amiss.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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