Thinking about spooge here. Has it been burning trans oil? Any chance of a blown seal?
Did you measure you ring end gap when you had the jug off?
From my experiences worn top ends usually result in the bike losing its snap in the lower throttle openings. Once you rev the tits out of them they still run alright. In a 4T easily diagnosed because you'll be burning oil. Can't really use this to check on a 2T :P
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