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Yea, that is way too high. Thankfully your bike is nice and old so idle adjustment is simple. Look for a knob in between the 2nd and 3rd cylinders carburetors. This should be accessible without removing any bodywork, but I'm not certain with your bike. You should set your idle to something between 1~2k rpm when the bike is fully warmed up. If your carb hasn't been serviced in awhile having it idle at 2k rpm will be more stable.
turn the cable adjuster back to its original position ie between 600-700 rpm look to the left hand side of the carbs you will see a large adjusting screw on a metal bracket whilst engine is running turn inwards towards rear wheel until between 1000 - 1500 rpm remember to warm engine first as rpm will rise if idle is set with a cold engine as the engine warms up when riding
Must be throttle sticking . Check , Cable at carb end is in holder , Cable is not kinked, Cable at handlebar end is properly in slide, Pistons in carbs are free to slide There are no obstructions in carbs. Try, Disconnecting cables from carbs ( if your bike idles , its the cables) Removing air intakes and looking down the carbs with a mirror and torch ( slides should be seating almost closed)
If your bike has ever sat for more than a few months at any time, the carburetors could be plugged with gasoline residue. If so, they will need to be disassembled and cleaned.
Otherwise, make sure all of the normal tune up items have been performed; valves adjusted, air filter, spark plugs, etc. And make sure there are no air leaks between the carburetors and the engine.
Finally, if the above things are all good, then I would perform a compression check. With the throttle held wide open, you should see at least 140psi of compression, on every cylinder. Anything lower than that will cause an erratic idle quality and overall poor performance.