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Howdy: Sounds like the carb is jeted to much. Slow revs mean too much gas is coming in thru the needle and main. Pull the jets and go down around 3 to 4 sizes. If the revs perk up your on the right track.
Go the the web and get "carb jetting procedure" for your carb. Plenty of help there.
It will take a while but it should run better - Ride safe - Doug
It has been 35 years since I worked on a 360 as a mechanic at Lynn's Yamaha in D.M. Iowa. You have one of the few left alive. Pull the air cleaner off and look at the slide in the throat of the carb. Does it move all the way up and down freely when you twist the throttle? Is there play at the top of the adjuster on top of the carb? I think your bike has an oil pump for the 2 stroke oil. Remove the front right cover plate, (I think it had a right casing cover separate from the pump cover), and look at the operation of the cable wire on the pump. Both the slide and the oil pump cables should have some free play.
Are there reeds on your carb? The reeds will be between the carb and the cylinder if you have them. Are any of the reeds cracked or broken? Are all reeds fully closing? What condition is the rubber between carb and manifold? Get back to me with the information and we can go from there.
Check the choke to see it is not stuck on.
Something is causing the bike to run rich as you said.
Make sure the throttle slide isn't stuck and is working ok.
Try a smaller size jet.
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