Problem..

[TheThief]

Hello...i am new here in the forum  and as others i have a Honda cb750 1981 supersport.... but... its has 2 years inactive and when i started it i was fine on idle oil changed and in good condition the flywheel screws where tighten for that noise that was making and then i started to open the throttle but here is the problem its was flooding and missfire alot i cleaned the carbs and one air screw was missing from the n'4 carb i found and bought one i set them to 2 and half turns and i tried again i put the air box and connected only carb 1 and 4 the two from the center was without the air filter and i started it i run very nice without missfire but i remove them and to clean the engine and putted again back i didnt connect the air and started it but it was like before missfires and doesn't go more than 8k rpms :( and missfires alot if i open full throttle please help me
and sorry for my bad english i am from greece....

thanks for your attention
if i am in wrong section forgive me  i am newbie :)

[TOOLS1]

Sounds like you need to install the complete airbox assembly. The see if it is still doing it. These bikes need the vacuum created by the stock airbox to run correctly.
TOOLS

[TheThief]

I set the air screw  tighten back  puted the air box complety but when i hit the throttle is has a little bit of lagg its normaly because no extra gas is going from the air screw... and it stops at 9k rpms now should i set them around 1 1/3 turns as manual says and then to adjust them with the idle...

[TOOLS1]

That screw is actually a "fuel" screw, and not an "air" screw like on the older carbs. Turning is out will richen the mix, and turning it in will lean the mix. However turning that screw either way is not going to help your problem. It does sound like it is running lean, and might have a vacuum leak. To diagnose the problem we need a little information. Do you have the clamps on the rubber boots tight? Are the rubber boots in good shape (nice, and soft)? Does it run better with the choke on?
TOOLS

[TheThief]

The rubber boots are in good condition and the clamps are ok not tight,   no vacuum leaks, no it doesn't work better with choke  i will post a video to get an idea with what i am dealing.....but i need to open  fuel screw without removing carbs to see if it change something...

[cardinal430]

I never knew that, years ago I just packed my air box with some general household air cleaning stuff with some aluminum screen above and below to keep it in place. I wonder how badly this affected the bike and if it is the cause of my fouled plugs / poor performance at about 60 mph. ??