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I've had two CG motors where the o-ring wouldn't seal where the intake tube meets the head. This caused a symptom where if you revved the engine, it would take several seconds to calm down to idle. On one of them, the o-ring was simply not inserted into the groove properly. On the other, the groove was cut too deep, resulting in no seal at all. I stacked two o-rings in the grove and called it a win.
None of this sounds like the symptoms you're seeing. I agree that the next step is the carb and exhaust.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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