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AA S200 power problem!!!

Discussion in 'Anything Airgun Related' started by deano007, Jan 23, 2014.

  1. deano007

    deano007 Well-Known Member

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    Hi< ive recently bought a used AA s200 and have a problem thats getting on my nerves. Just had new spring fitted and was firing a healthy 11.6ft/lb when i picked it up. Brought it home refilled to 200bar and the pellets were barely reaching the target at 15yds, i took it back and it made a complete liar out of me and started firing normal again. Took it home again, refilled back to 200bar and wont even fire the pellets out now so there is 2 stuck in the barrel. Anyone else had similar experience and know what the problem is??? Cheers
     
  2. Soximus

    Soximus Busy Member

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    Behind you! Mwhahahahah Just kidding. Christchurch
    Does it shoot OK at lower pressures? Say 170 BAR.
     
  3. deano007

    deano007 Well-Known Member

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    Havent had a lot of time to try it but i would say probably yes....
     
  4. deano007

    deano007 Well-Known Member

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    Just to expand, ive filled a couple of times to 200 bar and TBH it has hardly gone down in pressure even though i put forty pellets through approx, which were all extremely underpowered shots.
     
  5. terry1001

    terry1001 Major Poster

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    It's not easy to diagnose problems from a brief description but it seems to me as though the firing valve is not being opened enough to pass sufficient air to reach full power. Obviously the first thing to do is remove the pellets stuck in the barrel and then dry fire it until the pressure has dropped to 150 bar. The air pressure in the cylinder holds the firing valve on its seat and when the hammer falls it pushes the valve open letting air through and then the hammer returns and the cylinder pressure closes the valve. If this is the problem then it may take some time to get down to 150 bar but you should start to hear more air escaping as the pressure drops.
    This could be caused by a weak hammer spring.
    Another possibility is an obstruction to air passing through the transfer port to the barrel, this falls under the umbrella of 'increasing power' and can not be discussed on the open forum. If you start making any adjustments to the rifle then you really should have access to a chrono so that you can keep track of the power output, if you're not used to pcp rifles they do seem underpowerd compared to a springer due to the much lower noise levels and abscence of recoil.
    Normally these rifles work much better when filled to lower pressures, each is different but 160/170 bar max is probably about right. Check with the gauge on the bottle or pump not the one fitted to the rifle.
     
  6. Chinnymonster81

    Chinnymonster81 Busy Member

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    Just a point but you are making the mistake of filling based on the gun gauge as it could be well out and you might be over filling. Pcp air flow is very simple on air arms guns so its either not opening the valve long enough(too much air pressure or too strong a valve spring), the valve is damaged and has a lip that is restricting airflow (there is a very detailed post on here about that by cloverleaf I believe) or as previously mentioned an obstruction in the transfer port, a weak hammer spring or binding hammer. And finally a missing/leaking transfer port seal and the same for the breach seal. Outside of those there isn't much else that can really cause it to be down on power. What spring was fitted ? Oh and I think you will find the max fill pressure should be 190bar max the cylinder is rated 200 for a safety margin. Don't fill above 170/180 if you can help it as this is about where the sweet spot starts on most air arms guns.
     
    Last edited: Jan 23, 2014
  7. deano007

    deano007 Well-Known Member

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    Thanks for the advice guys, their isnt a gauge on the gun i only go off what the bottle gauge says, its brandnew so assuming it is correct. The hammer spring has just been replacd with a new one and had to be cut down alittle to actually get it in so im assuming it be strong enough. would filling it to 200bar stop it from actually firing the pellets out at all though???
     
  8. Chinnymonster81

    Chinnymonster81 Busy Member

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    If the spring had to be cut down it probably isn't a genuine replacement part. If its too weak or is causing the hammer to bind occasionally (not finished correctly) then this is probably where your problem is. Check out bgaltd on the web he has all the parts and exploded diagrams you will need. Seeing as the problem is intermittent then it is probably the hammer binding.
     
  9. sharpsman

    sharpsman Big Poster

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    If the gun is brand new it should not have needed a new or a cut down hammer spring in the first place,take it back and get a refund or an exchange.
     
  10. deano007

    deano007 Well-Known Member

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    it isnt new mate.
     
  11. timmytree

    timmytree Pro Poster

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    200 bar is way too much air for any s200 unless its been regulated, the sweet spot on most of them is 165/170 down to about 100 bar.
    Anything above that will be way underpower.
    Before you pull it apart, dry fire it and get the pressure down to about 130 bar and try again.
     
  12. andy draper

    andy draper Posting Addict

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    Does it only do it when you have topped the gun up? get your barrel clear,top it up to 180,dry fire it a few shots,then try it with a pellet in and see how that goes.At least it will give us an idea of were to start.Also check the little o ring on the pellet probe were it seats in the barrel when you load a pellet.
    andy.
     
  13. tomsteebs

    tomsteebs Donator

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    Just fill to 180 and use from there, I had a tuned s200 which was fine with 200bar, but it is probably just fill pressure. I have a rifle which needs a low fill pressure to work accurately. Each rifle is different
     
  14. deano007

    deano007 Well-Known Member

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    Well it would appear the problem wasnt the filling but infact the stock, yep u heard right, the stock. Everytime we fired with the stock off it wqs fine, put the stock back on and it wasnt fine! We eventually found that if u tighten the screw underneath nearest to the trigger too tight it mustve been warping the stock and estricting the hammer action. I eventually fettled it, put it back together and traded it in against a new bsa scorpion, didnt like the s200 anyways, ugly thing in my opinion!!!
     
  15. andy draper

    andy draper Posting Addict

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    Nice bit of detective work there mate,hope you enjoy the scorpion.
    andy.
     
  16. ratman60

    ratman60 Very Active

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    hello, this is correct as 190 is the max fill and best between 50 and 180
     

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