1981 Honda cb 750c carb issue , need help .

[jamthebamm]

I noticed there's a weird noise is comin outa engine when the bike is idling so I was wondering if the noise is bad synch carbs or camshaft adjustment so I went to play around with the fuel/air screws first before I go threw camshaft adjustment .I pull all the screws back to factory setting (1 3/4 turn...  the fuel/air screws were somewhere between 2 , 3 when I changed them ) and warmed up the bike and started changing them ( started off with the second carb ) . I noticed they don't do much even when I turn them all the way in the bike is still running which I assume it should shut off the engine !!! when I turned it wide open (3, 4 turn ) it started decreasing rpm.
Last month I helped My local mechanic to clean the carbs and I'm sure he didn't mess up the pilot/main jets but he didn't synchronized the carbs properly either . He just bench synched them ( needle technique ) and then he put the carbs back on and turned the bike on and adjusted the throttle screw.  I don't know if I need to rejet the crabs or if it's something else ?
I checked the spark plugs before I changed the screws and they were all dry black with carbon deposits over them which I guess indicate rich running bike .

[motogrady]

I'd go back to 2.5 out on all 4, maybe clean the plugs, and be real quick with
feeling how a 4 cylinders heat up, and look at that carb if one lags with temp increase.

[Re-run]

Well the screws are fuel screws. Turning them out makes the idle mix richer. So when you turned them out, more fuel got in which will decrease rpm. Start off by pulling the carbs off and rebenching them. When you do it, if they are anything like my v45 carbs, use something like construction paper to set the flaps. Set the fuel screws to factory settings and clean the spark plugs.

The screws do not completely cut off fuel to the carbs, so the engine will stay running, it just leans it out quite a bit.

So now, provided that all the passages and everything are nice and clean, you should be able to mount the carbs and start the bike with no issues. From there, a good tach and some tuning should have you going good. Make sure the filter is clean.

As for the noise, it was likely from the bad sync. It makes the bike sound like a washer when idling in neutral. Pull in the clutch and if the noise goes down, that is exactly what it is. So, get some good vacuum gauges and get a close sync and most of the noise should be gone.

[jamthebamm]

Thanks Re-Run u were right it does sound like a washer in nutral .
I pulled the screws back to factory setting and cleaned the plugs
Too , the air filter is brand new K&N which I changed it last month ,
I guess all I need is to sync the carbs properly .She starts right up
with no hesitation , even here in Brooklyn with
The cold shity weather just need to put the chock on and brrrrrrrr
Throttle works fine too no hesitation .no black smoke . I guess
Im all good to go , just need to fix the charging issue which Im still waiting for
The regulator that I bought from ebay  .