RHS power valve cover off. Pipe on. Run the bike and watch to visibly see where its jamming/whats happening. Disconnect the actuator arm from the plate and watch again. If its working in the later instance the problem exists in the drums/flapper. If not, something down in the governor and arm assembly.
I'd personally look at a good cleaning and some new bearings in the drum assembly. Clean running and no spooge can tend to result in more hard carbon buildup as opposed to just messy oil.
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