Could be carb or could be coil or pickup. No second advance would make it start fine and idle, then as the rpms clime it doesn't switch to the 36ish degree advance so it is running retarded. Tap the coil some with the bike idling and see if it changes how it is running, also see if it runs decent in higher rpms, right after you start it with a cold engine. The see if it get bad once everything is up to full temp.
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