Scubapro G250 can't be serviced??

[Couv]

First one yes, second pic looks like an aftermarket from VDH.

SP had white balance chambers at one time. In fact, the balance chambers that VDH sells are new old stock from that period. While I prefer the newer longer balance chambers there is nothing wrong with the older style (black or white) as long as they pass the bounce test. There is no reason to believe the OP cannot upgrade his G250 simply by replacing the old poppet assembly with the new S-wing poppet assembly.

Upgrading the G200 is similar. Just replace the old poppet assembly with the new Duro poppet assembly or an aftermarket poppet that can be found here: Store | Vintage Double Hose

In both stages, retain the lever, spring, spring pad or balance chamber.

 

[Open Ocean Diver]

Also don’t forget about the lever update.

There are S-wing poppets with just one or with two O-rings.


See here:



The second one is matched with a new model of the balance chamber (I think it was released with the G250V) and requires the new lever with curly feet.

Here you see the two different balance chambers, and again the newer S-poppet with double O-ring, which should be used with the longer, finned balance chamber (the left one):



Most of my 109 use the single-O-ring S-poppet and have the traditional short balance chamber. Only one of them (I have a total of six 109, one 129 and one 156) has the double O-ring, the finned balance chamber and the curly-feet lever. Another one is still using the previous three-parts poppet with the stainless-steel rivet, albeit I plan to upgrade it quite soon, as it is now service time for it!


Angelo Farina

FIPS/CMAS Instructor (3 stars)

Marine scientist (underwater acoustics)

 

[Couv]

Can anyone tell me if these are the correct balance chambers?

Yes to both.

 

[Open Ocean Diver]

Yes to both.

Do you know why SP increased the length on the BC barrel?

 

[shurite7]

Also don’t forget about the lever update.

Angelo Farina

Good point. This is correct. It is easy to forget this step, which is why I made a note in my schematics when I first learned about it.

 

[shurite7]

Do you know why SP increased the length on the BC barrel?

I’ve never asked nor heard anyone else ask why. What I have noticed is, the older shorter balance chamber leaves the inside o-ring exposed, whereas the longer balance chamber is more suited to protect the o-rings.

 

[Rusty Shackleford]

Likely due to the length of travel of the adjustment knob in a later regulator.

I doubt it matters a bit in a 250

The small black is a one piece. The small white is a two piece. It has a collar that allows the spring to rotate independent of the balance chamber.

 

[buddhasummer]

Wouldn’t one of those complete G260 service kits, with the poppet, work in the G250? Left over parts aside.

Yes, they don't contain flow vane C clip, can't remember if they contain flow vane O ring, think they do but I usually give them both too if know the person is buying the kit for a G250 conversion.

 

[buddhasummer]

What is this?
G250V/G260 long crown X type balance chamber.
Where do I buy it?
Do I buy same service kit for G200?

I can get all the parts you need but not at the low prices being mentioned in this thread. I did message you.

 

[buddhasummer]

Long crown, my preference.