Scubapro Mk25/S600 Performance Questions

[underH2Oman]

It is all about adjustment. It is up to you to have the discussion with the facility if something is not working to your liking. I think they would adjust it for you.
I set my personal regulators at .8 as they can be adjusted to increase the resistance if I am diving in an environment that may require it, like a current.
Scubapro recommends to set the cracking pressure between 1.0 and 1.4. I would ask the shop to set it at 1.0 in the fully open position and I think you will be happy.

 

[mike_bayer]

Where can I learn to adjust the cracking pressure on my Scubapro G250?

I found parts diagrams but nothing on how to make the adjustment.

My adjustable seconds are all set so that there is a very slight free flow with the knob all the way open. Specs may say 1 or 1.1 for new reg but when you get some experience those numbers are more like guidelines. I actually prefer a cracking pressure of around .8 to 1.9 or whatever it ends up being. But I do not set new regs like that. Those are my own preferences. And that is what they usually end up at after a few dives and the seat settles in. I never dive with the knob fully open. It is usually a 1/4 turn back or so.

 

[Zung]

Easy: remove the hose; inside the barrel, there's a white thing with a slot called an orifice; find an appropriately sized screwdriver, press the purge, give it may 1/8 of a turn counter clockwise, put the hose back, pressurize, see if it hisses; repeat until it does; then repeat in finer increments/decrements to find the point where it just stop leaking, give it an extra 1/12 of a turn clockwise and you're there.

Easier: get this tool and you don't have to remove the hose/pressure all the time.

All my G250's and 156's sort of "naturally" settle to just under 1" of cracking pressure.