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Thread: S400 help

  1. #1

    S400 help

    have the option to buy a S400 classic..at the moment no matter how much charge is in the rifle it hasn't got enough power to push a pellet out...any ideas how to fix this? or is it a trip to the gunshop? It does cock and fire, but sounds like a wet fart and blows as hard...

  2. #2
    SD Regular
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    Sounds like the o-rings need a good servicing/replacement as a first action.....

    My Daystate does that when the battery's low - but don't think the S400 has any power source in it?
    Nooooooooooooobody expects the Spanish Inquisition!! Our main weapon is.........

  3. #3
    if you need to ask then take it to a gunsmith . if you do it,it could finish up above the legal limit

  4. #4
    how much charge are you putting in it? if you go too high the hammer will not fully open the valve, (of course if you go way too high the cylinder will distort and become useless ) 170 bar from memory is the preferred fill level
    "Politicians must be allowed to panic. They need activity. It is their substitute for achievement"
    "'The matter is under consideration' means we have lost the file. 'The matter is under active consideration' means we are trying to find the file."

  5. #5
    Best bet if you can't do it yourself is to look up Kevin Todd on the AAOC, he will sort it for you and it will come back a much better rifle than you bargained for.

  6. #6
    I just thought there might of been a quick fix...only put 100 bar in it to try it...off to glenluce gunroom on tuesday to pick up my shotgun so i'll just take it along there and see what they say

  7. #7
    Quote Originally Posted by cowsmart View Post
    I just thought there might of been a quick fix...only put 100 bar in it to try it...off to glenluce gunroom on tuesday to pick up my shotgun so i'll just take it along there and see what they say
    from memory (again) 100bar is right at the minimum level, a bit below that and the reservoir discharges, try 170 and see what that does
    "Politicians must be allowed to panic. They need activity. It is their substitute for achievement"
    "'The matter is under consideration' means we have lost the file. 'The matter is under active consideration' means we are trying to find the file."

  8. #8
    Quote Originally Posted by kennyc View Post
    from memory (again) 100bar is right at the minimum level, a bit below that and the reservoir discharges, try 170 and see what that does
    I agree with the above. I have a s410 and the 'sweet spot' runs from 170 bar down to 100 ish, after which power drops off quite quickly.

  9. #9
    Question... Have you filled up to recommended pressure... as stated in hand book... 190 bar... and is it holding air...

    if you can hear air leaking from loading port or put soapy water around port... if bubbles appear then you have a leak and will need to replace the 2 O rings on the loading port.... caused by wear and tear...the O rings were worn.... that is what was wrong with mine it took 2 minutes to diagnose and repair. at the gun shop.

    I'm led to believe that if the pressure drops much below 80-90 bar then the gun can dump all the air in the cylinder...rendering the gun inoperable..

    David

  10. #10
    Assuming it holds air ok, the valve, its return sring, the hammer and the hammer spring are ok, there are a couple of o rings which may be the cause. One seals the pellet probe (Bolt) the other seals the action to the top of the valve (transfer port). A leak of either will give you low power and in this case the gun will sound very loud. You'll need a chrono to check it. If it is a later gun it'll have anti-tamper on it which will need removing for most repairs.

    It will be less than 80 bar when it dumps the air, probably 40 bar. This is a problem if you use a pump as it can be impossible to refill; no problem with a bottle as you can shock it shut with 200bar. In any case when this happens, make sure you cock the action before refilling as the pressure of the hammer on the valve will not allow it to seal.

    Your average gunsmith wont know what to do with it.

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