float level maybe just sitting right at the threshold of adjustment to keep it running when it's up? Didn't 300 cc have fits after setting his up while on stands then finding it wouldn't run when he put it on the ground? I also notice it doesn't look like any change in belt position while he was revving it, but don't know if he got enough rpm for it to shift. Other than that, i wonder if something is stripped or broken in the tranny and it'll free spin with no load but locks up when it's loaded. I wouldn't quite expect no engine rpm increase at all from that, but strange things happen with busted metal sometimes.
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