Air Venturi Avenger Loss of Power

[stroke]

Tying to I.D. a loss of power in both a .177 and .22 Avenger.

Both a .177 & .22 operated correctly for 6-9 months, then the loss of power in both guns. Spent 4 months sending the .177 back to Air Venturi multiple times. No joy!

I first measure efficiency with a chrono. I measure mutiple reg pressures looking for the knee. Enjoyed shooting well for 6-9 months. Now I get a 80-100 fps drop in efficiency compared to the original numbers. Also shooting, used to get 2nd zero at 60 yards, now its 45 yards (backyard max range).

Didn't notice any air leaks. Cleaned the barrel. Virgin at taking the gun apart, but I got the Aveger seal kit and replaced the reg and hammer spring. Didn't fix the problem. I read on posts the O rings need lube or replacing under the reg.

How do you get the Belleville washers and O rings out for servicing. Looks like you need to force them. Didn't want to without more info.

Replaced the reg with no service to the O rings because I didn't know to remove them.

 

[CharlieF]

If you are not experiencing any air leaks, it could be that the hammer spring has "worn in" and just needs to be adjusted to provide more punch. Tighten the pressure on the spring one half turn, chrony a few shots and see if the velocity comes up. Keep increasing the hammer spring tension until the muzzle velocity comes up to what you want. It is common for the spring to lose some tension as the rifle is broken in.

 

[nervoustrig]

Note there is a duplicate post that so far has multiple replies

Air Venturi - Aveger loss of power

Tying to I.D. a loss of power in both a .177 and .22 Avenger. Both a .177 & .22 operated correctly for 6-9 months, then the loss of power in both guns. Spent 4 months sending the .177 back to Air Venturi multiple times. No joy! I first measure efficiency with a chrono. I measure mutiple reg...

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