Ftp 900 set up help

Discussion in 'Air Arms' started by skjutglad, Apr 13, 2019.

  1. skjutglad

    skjutglad New Member

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    Tåstarp skytteförening
    Hi everyone.
    I am trying to help a friend that owns a Ftp 900 and have used it alot the last
    4 years. He shots for the Swedish national team.
    He has had problems that the gun doesent shoot consistently and
    he bought a Huma reg because there is no AA service in Sweden.
    As he thought this was a reg problem. But problem remain.
    I told him that maybe he need to take it apart and clean the hammer.
    So I will help him with this.
    The problem is that the guy he bought it from took away the air adjustment screws
    and only have the covers left for the adjustment screws.
    He has the screws but not in the gun.
    Could someone help me how the gun should be setup in a zero point so we
    have something to start from when we try to adjust it.
    Is there some start position how the set up should be?

    Greatful for any help.
     
  2. ChrisJ

    ChrisJ Member

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    EAST DEVON FTC
    By the sound of it the previous owner set the power solely on the hammer spring which is totally wrong. replace the adjustment screws in each side but don't wind them in fully . With 8.4 pellets set power on hammer spring so it shows 820fps, then with left hand adjustment screw (parallax wheel side) wind in until you get to your required FPS setting , say 780fps then put cover screw in place ,the right hand adjustment screw can be used for fine adjustment if needed but just wind in enough to screw in the cover screw. Hope this helps you find some consistency . you may need to play around a bit with the adjustment screws but the main thing is to set to hammer spring 1st.
     
  3. skjutglad

    skjutglad New Member

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    Thank you ChrisJ for the info.
    It helps a lot to get a starting point.
     
  4. skjutglad

    skjutglad New Member

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    As mentioned above I am helping a friend to set up his Ftp 900.
    I now have a problem I can't get the gun up to speed.
    I have put in the old original regulator that was serviced by AA last summer
    and I can only get 235 m/s with max hammer preload.
    I thought maybe the reg is not working properly and I put in the new
    Huma reg preset to 95 bar. No change I then set the Huma reg to 110 bar
    and I could get 239 m/s.
    I just can't figure out why I can't get up higher in m/s.
    As mentioned by ChrisJ I should get 249 something and then turn in the
    adjustment screw to the speed I wanted.

    I have checked that the barrel is in position , I have all the screws on left and right side
    Out to max.
    The valve and seat where the regulated is connected is clean without any mark scratches.
    Does anyone have a clue.
    The only thing was that the gun from the start was hard to get up in speed he was told
    when he picked it up from the Swedish dealer.
    My only thought is that maybe the hammer spring is to weak.
    We only have 10j in Sweden so maybe they have put in a weaker one from factory.
    Greatful for any help.
     
    Last edited: May 1, 2019
  5. miketowler

    miketowler Active Member

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    Nomads, furnace mill
    Have you cleaned any grease or oil from the hammer bushes, these need to be dry
     
  6. skjutglad

    skjutglad New Member

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    That's something I need to ask how do you remove the hammer.
    I have got the spring out but do I need to remove the loading arm
    or does the trigger need to be taken apart in anyway?
     
  7. miketowler

    miketowler Active Member

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    Location:
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    Nomads, furnace mill
    Sorry I’ve never stripped the 900 but I’ve had similar type of problem on 2 other AA rifles
     
  8. skjutglad

    skjutglad New Member

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    I thought it could be some problem with the hammer. It shoots very even in speed over the chrono.
    Doesn't change much.
     
  9. miketowler

    miketowler Active Member

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    You could try spaying some wd40 or similar into that hammer area, if it is that problem it should help a bit and prove it is that before you strip the gun
     
  10. EV2UK

    EV2UK Active Member

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    Southampton Buccaneers
    May sound a bit too simple but have you Checked / replaced the small o-ring just inside the barrel?
     
  11. skjutglad

    skjutglad New Member

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    Yes, new.

    The only thing I can think of is that in some way the hammer can't hit the end of
    the valve far enough so it doesn't open as it should.
     
    EV2UK likes this.
  12. miketowler

    miketowler Active Member

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    If this guns been played with the hammer may of been lightened or the valve been shortened or even the spring shortened or a lighter spring fitted for something like 10meter target at something like 6ftp, I must say if I was in your shoes I’d get a new hammer spring and valve, as you’ve done reg ect that replaces all it could be
     
    sillywizard likes this.
  13. skjutglad

    skjutglad New Member

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    Well I guess that's the only thing left.
    I will get a new spring and valve and see
    if this helps.
    Thanks all for trying to help.
     
  14. miketowler

    miketowler Active Member

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    If the hammer looks as if it’s been messed with change that also but you will also need the bearings
     
  15. Evo

    Evo Scouser by Birth mfta shooter by choice

    Joined:
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    before you strip it totally, undo the four grub screws on the top of block that are holding the barrel in place, try rotating slightly and see if the speed increases, iff it doesnt then try rotating the other way slightly because if its not lined up correctly over the transfer port then it will restrict the air flow, sounds daft but this happened to me on my ftp, as i rotated the barrel then fired the speed would increase,when i turned the barrel too far the speed would slow down, you will know when its correctly aligned as the speed will be at its maximum, running the huma reg at 95bar should be well enough, 110 is a bit high, good luck but it might not be this but best to try before you start stripping the rifle totally down
     
    Darron likes this.

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