Need help with classic valve

[DSR75]

I just bought a 68 classic off ebay. I aired it up to test it and I'm having a problem. The first shot is fine, the next couple all seam to die and finally I can't shoot anymore. I adjust the velocity and it works for a shot or two and does it again. All I know is it's a 68 classic. I don't think it has a level 10 but I'm not completely sure. Any help is greatly appreciated. Thanks

[geekwarrior]

are you running air or co2?

-make sure you have enough air in the tank, mags require a bit of pressure

-also find out if you have a lvl 10....look on the automag site to see pics of the difference

[Dayspring]

If all else fails, change the reg-seat oring. (it's the big thick oring between the valve halves. it could have deformed and is choking the gun.)

[DSR75]

If all else fails, change the reg-seat oring. (it's the big thick oring between the valve halves. it could have deformed and is choking the gun.)

I changed an oring shortly after posting this thread. I think this is the one that I changed. It sorta helped. I just can't turn my velocity down too low before it does again. I don't have a chrono so I have no clue at what speed I am shooting.

I have an HPA tank that's full. It has the level 7 in it as well.

[Coralis]

This is the one he is talking about Regulator seat

[DSR75]

I'll change that one tomarrow. I have another around here somewhere. Thanks.

[Tunaman]

Just overhaul the entire valve and check everything. If you just got it then there is no telling whats in there...