94 cbr 600 f2, when rolling down on throttle and reducing speed, i hear chattering noise. once i pull in clutch or throttle up, noise goes away. seem to think its trans syncing or grinding teeth. am i correct?

Question edited for clarity.
Question moved to model category.

The carb needs cleaning, likely blocked jets. Maybe a torn diaphragm or two.

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Does the motorcycle to to go forward when you drop it to first gear with the clutch pulled in ?
If not then it could be the kill switch for the clutch is not working properly. If you left the bike in first gear and you try to start the bike
without the clutch pulled in the bike not start until the clutch is pulled in.

It is under the seat mounted to the frame.

The noise may be the classic Yamaha whine. I have had a Virago & Vstar1100, They all had various noises that came from within. You may notice the distinct whine/whistle at lower speeds and during acceleration. Seems to go away if you pull in the clutch or let off the throttle, not so noticable on the freeway. This appears to be a common phenomenon and I have seen it attributed to Clutch, transmission, and/or shaft on a lot of Yamaha bikes.
I hope this helps.

The base setting for the air mixture screw is 2 to 2

No oil chain is behind the clutch I think. It's either the clutch (does the noise go away when you pull in the lever?) or the cam chain.

Sounds like the carbs were not properly cleaned or set up. Choke should cause the cold start rpms to be higher than what you are experiencing. Application of choke to a warmed up engine will usually cause the engine to stall.

this sounds like it could possibly be a noisy thrust bearing in the gearbox itself

Where the noise is coming from?

Head of engine?
Centre of engine?

Do you feel that your bike is riding heavy that is you are forwarding the gears but the load of engine is not lightning.

Please reply me then i will tell you the solution.