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I'm assuming that you get proper airflow without nozzle or nozzle cap in place. If so, then there is a restriction between the nozzle and the nozzle cap somewhere. Remove the needle cap (doesn't affect airflow, only protects the needle) and look at the nozzle/nozzle cap from the front. There should be a gap between and around the nozzle and the hole in the nozzle cap - it might be small but must be there - it's where air passes over the nozzle to 'suck' paint out. If there is a gap then you might have dried paint inside the nozzle cap since if you loosen it airflow increases. If there is no gap then the nozzle isn't seated properly - something is causing it to protrude to far into the nozzle cap. Check the fit of the nozzle into the head cap - any paint, roughness or whatever. HTH but hard to diagnose without looking at the AB so If none of the above, Iwata service will help.
tyhe314Oh and what do you think is causing sputtering?
On the CS and other internal mix airbrush, air comes out between the paint nozzle and nozzle crown. An inproperly seated/dirty crown or broken paint nozzle can cause the air to sputter. The CS nozzle is a self-centered design which could cause sputter is NOT seated properly. How well the inner nozzle centered when you look down the airbrush from the front?
From your discription, you are not talking about paint spatters which is usually the result of damaged needle and/or nozzle.
An online resource for trouble shooting.
If everything else fail, call Iwata service. Good luck.
I'm not familiar with the Iwata HP-CS and its nozzle and nozzle cap. However, air doesn't flow through the nozzle - only paint. If you loosen the nozzle cap and air flows then the nozzle cap opening is being blocked (screwing nozzle cap in too far?). Is there an O-ring behind the nozzle cap and is it missing? Or is it a 'rubber' one that's getting old. The nozzle cap has a hole in which the nozzle must center and yet leave space around the nozzle for air to flow - if that space is restricted airflow will decrease. Alternately, have you made sure the nozzle is inserted (screwed or pushed - don't know the CS) firmly. Not having the nozzle properly seated could also cause the problem by reducing the space between it and the nozzle cap. Hope this makes sense and that it helps.
How's the airflow with the brush "naked"?
Had something like this happen with my H&S Evolution, and it wasn't about the nozzle being cleaned so much as the nozzle's exterior and the nozzle cap. Weird I know, but it worked.
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