POSSIBLY (if present - happened to me on a different bike) a mechanical link between choke and throttle got stiff so 'choke' (the 'a bit more throttle' component) kept the revs up.
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When a engine is cold the revs should be higher ( choke on ) but nit going up and down. If you release the accelerator and the engine still rev's up maybe the accelerator cables are not properly installed on the carbs. Also a air leak is possible. Check the cables and air leaks at manifold including the holes from manifold where vacuum gauges should insert when carb calibration is necessary. Those holes should have some caps on.
If you have an aftermarket exhaust fitted this could be normal, It depends on the range of the change in revs. 50 or 100 revs up or down at idle is no big deal.
you need to clean or replace your idle air control valve(IAC). The IAC allows your engine to idle smoothly by opening and closing a valve that allows air flow to the engine that is monitored by the computer. The IAC get dirty causing it to stick and move slower than it should which causes the up and down idle
Try changing your idle control valve or stepper motor which is the same thing.try cleaning it first before buying a new one,this could be done with caburetter cleaner, let dry before replacing,hope this is helping ty.
my rev will not go back down when I rev it
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