Kobalt gravity spray gun and I have a little air that comes out constantly. Why is that and how do I stop it? Thanks

I've found over the years the least amount of times you can tear a spray gun completely apart the better. Usually a real good 'flushing' with lacquer thinner will suffice. I will take the air cap off and let it soak in thinner to dislodge any build up but other than that, I simply run thinner thru till it runs clear out the tip.

I also 'back flush' which involves having thinner in the cup and the air supply hose attached. the air pressure should be adjusted quite a bit lower than what you use for spraying paint.

Then you place a clean shop towel or rag over the air cap of the gun and pull the trigger. This forces air back into the paint cup 'back flushing' the gun. Then take the rag away from the cap and pull the trigger again to run thinner thru the gun the normal way.

IF you still want to tear the gun apart for cleaning you can hopefully get some idea with this video link;

Quick Easy Way to Clean HVLP Spray Gun

Hope this helps.

it means the air holes in the nozzle are blocked the air couldn't get out in the front so instead it went back to the cup makes it bubble

Go back to where you bought it and have them photocopy the book from another unit. Good luck!

adjust the knob that holds the needle inside the gun

I was in desperate need of getting on with lacquering a guitar and it seemed everywhere I looked on the net just gave actual spray pattern issues.
There was a small article that suggested tightening the nozzle up. I had only finger-tightened it.
Problem now solved!!!

My #91011 One Quart is not a gravity feed, it is air compressor fee fed. My problem is the nozzle will not fan out . It only blows a round spray mist. ?

most spray guns are basically the same gravity feed is no different, air pressure into gun and out nozzle,spray pattern fan to spot and last the amount of fluid comin out of cup to the nozzle.

1. primer viscosity to thick
2. internal filter clogged
3. internal passage clogged
4. gun not adjusted properly
5. high build primer uses more air pressure
6. wrong needle and fluid nozzle
7. gun needs cleaned
   

It depends on the air cap\tip you are shooting with. For instance the 110 air cap is a standard compliant style. Were as the 105 and 115 are a HVLP style.

Have you traced the exact spot of the leak?
I will assume you have not. the reason it's important is because if there is a crack in the o-ring seat there is nothing you can do. So trace the leak. Try a small amount of auto air conditioner leak detector or something similar even ink from an ink pen will work. Place it in the air inlet, hook up your air line and trigger your gun for a 10 to 15 seconds. disassemble your trigger and see if you can locate the offending spot. Though this method has worked for me in the past, it's not something I would normally recommend. However the gun you have is to expensive to just write off.
The alternative is to contact Iwata and seek help.
Good luck.