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Fitting a New Mainspring

Discussion in 'Anything Airgun Related' started by BSA XL, Jul 20, 2014.

  1. BSA XL

    BSA XL Newbie

    Messages:
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    Location:
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    Hi All

    I've just joined and am looking for some advice on replacing the spring on my BSA Lightning XL Tactical.

    The previous spring broke in two last week. The rifle is totally stripped and I have fitted a new piston seal and have a no.1 Titan XS spring which is listed as correct for the rifle.

    The problem is the spring won't fit in the piston unless I remove the black plastic sleeve inside the piston.

    Is this normal or is the spring the wrong size? Do I need a piston sleeve? The spring is a loose fit without a sleeve.

    Thanks for any help.:confused:
     
  2. dave goodall

    dave goodall Donator

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    Make a new sleeve out of ptfe
     
  3. mattyts

    mattyts Donator

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    what Dave said,have any turners local to you?
     
  4. bhodge

    bhodge Keyboard Hero

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    Has your Titan #1 been specifically cut to size to fit your gun...or is it 'as they come'. In its standard (uncut size) it's almost certainly too long.
     
  5. tommy gun

    tommy gun Posting Addict

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    is the titan spring a no 1 the early bsa lightning mk 1 did not have a tube in it helps to keep grease in.Just get a plastic pop bottle and make a 1 out of that,don't forget to cut spring down 240mm and go from there.
     
  6. BSA XL

    BSA XL Newbie

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    Location:
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    Thanks for all the ideas. The lightning is about 8 years old I think. I have not cut the spring down. Would this just be a case of angle grinding a section off? Do I need to collapse the coils at the end or leave as is? What would the problem be if I didn't fit a piston sleeve?

    Thanks!!
     
  7. tommy gun

    tommy gun Posting Addict

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    yes cut off then collapse end, i have a mk 1 supersport with no sleeve in make no difference
     
  8. mattyts

    mattyts Donator

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    Cut it,flatten it,polish it
     
  9. Mrman

    Mrman Donator

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    Guys, What he is saying is the diameter of the spring is to large, not to long (even though he will need to trim it!!) If its not fitting you can take the sleeve out, it will still work! however you may get some spring twang.

    here's the things to consider!

    1, if you tune it without the sleeve, the spring will have less friction, there for at a later date, if you add a sleeve you may be down on some power!
    2, if you tune it with the sleeve you will get less twang but at a later date if you remove the sleeve or if it wears down,the power will creep up. there for, you may need to cut the spring down or heat a couple of the coils to loose some spring power.
     
  10. mattyts

    mattyts Donator

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    We know the diameter is too big,that's why me and Dave suggested getting a custom liner made :rolleyes:
     
  11. Mrman

    Mrman Donator

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    Good Man;)
     
  12. tommy gun

    tommy gun Posting Addict

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    he has to cut the spring down or it will be over 12ftlb
     
  13. Mrman

    Mrman Donator

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    Yes you are correct but he was asking if it was normal for the spring to not fit, not weather he needed to cut it down, I'm presuming he will crono it and then cut it down if need be.

    The only other thing i would suggest is, before you start cutting it down put a good few pellets through it until the crono readings are close, or your figures will be inconsistent, in which case you will cut the spring down a later find your power is lower then when you left it.
     

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