Hi
It sounds to me that the most likely is that the carb was not seated properly when you refitted it. This could let it suck air which would let it rev away. After you killed it and restarted this shaking could have provided a temporary cure by re-sealing the carb and curing the air leak.
On the track is a bit harder to explain but could be due to the air leak being large enough to totally screw the mixture, or, as Ian said, maybe a simple linkage problem when you reassembled.
I have actually heard of a TKM reving away with NO carb fitted when turned over on the starter! Presumably there was enough vapour in the crank to get it going.
My advice would be to rebuild the carb and reassemble everything with fresh gaskets, thoroughly check the throttle linkage and return springs etc and then let us know how you get on
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