Low Power S400

Discussion in 'Air Arms' started by Baldeagle, Apr 11, 2011.

  1. Baldeagle

    Baldeagle Member

    Joined:
    Mar 18, 2010
    Messages:
    34
    Location:
    Market Harborough
    Club:
    Kibworth
    My AA S400 has dropped to sub 10 ft/ibs, any ideas?
     
  2. chrispro97

    chrispro97 New Member

    Joined:
    Jun 10, 2009
    Messages:
    1,062
    Location:
    atherstone
    Club:
    purley chase ftc
    only fill the gun to 170 bar and then try it it will come on the power curve better because the gun oes not hav a regulator fitted,if you fill to 200 bar it will shoot low till the power curve comes in with the knock over valve,
     
  3. D Martin

    D Martin Non member

    What was it doing before mate ? If its from 11+ then that's a big drop. When was the last time it was serviced ?
    It could be something simple like a blown breach seal.

    Dave
     
    Last edited by a moderator: Apr 12, 2011
  4. Gilogrt

    Gilogrt Member

    Joined:
    Mar 15, 2010
    Messages:
    150
    Location:
    Warwick
    Club:
    Greyhound/Kibworth
    As Chris said. Fill to 160 then test. If it's still lo, can you hear air coming out from the pellet loading probe or beneath the breech block and cylinder upon firing? If so, one of the seals has gone.
     
  5. Baldeagle

    Baldeagle Member

    Joined:
    Mar 18, 2010
    Messages:
    34
    Location:
    Market Harborough
    Club:
    Kibworth
    Thanks for the replies chaps, gun is just over a year old, normally runs about 10.7/10.8. It has had about 3000 pellets through it. Barrel regulary cleaned but hasn't been serviced. No obvious leaks.
    Jez
     
  6. Gilogrt

    Gilogrt Member

    Joined:
    Mar 15, 2010
    Messages:
    150
    Location:
    Warwick
    Club:
    Greyhound/Kibworth
    May seem daft so excuse the question, you're not using a different weight of pellet and not doing the maths with the corrected weight?
     
  7. Petay

    Petay Member

    Joined:
    Jan 28, 2011
    Messages:
    96
    Location:
    Hertfordshire
    i would suggest it to be 1 of 3 things.... The o ring seal on the transfer port needs changing, the o rings on the breach end of the barrel need changing or its something to do with the hammer spring.

    Try putting a tissue over the bolt / breach housing and fire the gun making sure the bolt is closed. If the tissue moves you have a leak
     
  8. LittleJack

    LittleJack Active Member

    Joined:
    Feb 8, 2010
    Messages:
    533
    Location:
    cwmbran, south wales
    Club:
    Blaenau Gwent
    i have done a few s400's with low power and all of those were new(ish). it was the amount of grease sticking on the hammer and all the other gubbings.
     
  9. andrew27473

    andrew27473 Member

    Joined:
    Jul 16, 2011
    Messages:
    34
    Location:
    north wales
    Club:
    Clwyd phoenix ft
    I've had to do 4 of then because of this, all you have to do is remove the breech and barrel and take the back end of the action off clean the hammer slide as the grease on it picks up dirt and sets hard slowing down the hammer which drops your power.
    It's an easy fix.
     

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