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Airsporter mk6 low power ?

Discussion in 'Vintage collectable airguns' started by Barling Stu, Feb 12, 2014.

  1. Barling Stu

    Barling Stu Active Member

    Messages:
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    Location:
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    Hi all Ive spent the winter restoring my airsporter mk6 and I have replaced all of the internals including the mainspring all seals and the piston head. I even lengthened the stroke with a tr robb kit. The only thing I did do was carefully grind one coil from the mainspring. Although this may be the cause I thought it would still be putting out more than 510 fps. Any help appreciated. Please bear in mind this is my first resto. Ps ive included some photos of the finished rifle.

    Cheers Stu.
     

    Attached Files:

  2. Meteor62

    Meteor62 Major Poster

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    Firstly why did you take a coil off? Secondly did you finish the spring correctly or did you just hack it off and consider it job done?

    Check the loading tap for leaks too as this can be a problem on airsporters I believe.
     
  3. Barling Stu

    Barling Stu Active Member

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    I took a coil off because I had read some rifles can be over. I removed the coil and finely ground it so it sat nice and flat and level. Maybe I should have chronyd it with an uncut spring first. Still this is a learning curve for me. Ill look at the tap aswell. Does anywhere stock them?
     
  4. Meteor62

    Meteor62 Major Poster

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    Yes should have chronod first. Airsporters don't usually go over the limit. Although you have long stroked the piston you may still have been within the limits

    What pellets were giving 510fps?
     
  5. Jackroadkill

    Jackroadkill Donator

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    As said above, the finish on the spring is important. The last coil should be collapsed properly and the tail end should be ground, filed and polished until there are no rough edges to snag on either the trigger housing block or the piston. Did you fit a top hat?

    It's worth saying that they aren't the most powerful of rifles; I restored my Stutzen recently and I fitted a TR Robb stainless steel piston head and a Welsh Willy tuning kit. After a thorough de-burr, polish and relube the cycle is now far smoother and quieter but the rifle is not that powerful:

    [​IMG]

    [TABLE]
    [TR]
    [TD="class: xl63, width: 154"]Shot number[/TD]
    [TD="class: xl63, width: 99"]Velocity / fps[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"][/TD]
    [TD="class: xl63"][/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]1[/TD]
    [TD="class: xl63"]516[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]2[/TD]
    [TD="class: xl63"]509[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]3[/TD]
    [TD="class: xl63"]517[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]4[/TD]
    [TD="class: xl63"]513[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]5[/TD]
    [TD="class: xl63"]516[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]6[/TD]
    [TD="class: xl63"]520[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]7[/TD]
    [TD="class: xl63"]515[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]8[/TD]
    [TD="class: xl63"]516[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]9[/TD]
    [TD="class: xl63"]520[/TD]
    [/TR]
    [TR]
    [TD="class: xl63"]10[/TD]
    [TD="class: xl63"]509[/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD][/TD]
    [/TR]
    [TR]
    [TD][/TD]
    [TD][/TD]
    [/TR]
    [TR]
    [TD]Average[/TD]
    [TD="class: xl63"]515[/TD]
    [/TR]
    [TR]
    [TD]Extreme spread / range[/TD]
    [TD="class: xl63"]11[/TD]
    [/TR]
    [TR]
    [TD]Standard deviation[/TD]
    [TD="class: xl63"]3[/TD]
    [/TR]
    [/TABLE]


    This was after about 50 or so shots, so it's not fully bedded in yet - I'd expect the consistency to improve shot-to-shot and for the power to rise a little as it beds in.

    The Airsporter is a notoriously difficult beast to tame, in a lot of ways, but it can be done with a bit of patience and perseverance.

    Try Chambers airgun supplies or John Knibbs International for parts etc.

    Hope this helps,

    JR
     
  6. Barling Stu

    Barling Stu Active Member

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    Cheers. I was using h&n ftt 5.53. Ill try putting a new uncut spring in and hopefully itll improve. Does the top hat and longer spring guide make it alot smoother? Thanks for the advice so far. Like I say this is all new to me especially when it comes to removing coils.
     
  7. Jackroadkill

    Jackroadkill Donator

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    It makes the cycle much less prone to inconsistency, and therefore more predictable. It's the de-burring and polishing that smoothen everything out. Ideally, when you cock the rifle you should feel and hear no graunching or heavy friction taking place. In an ideal world the cocking stroke should be virtually silent. Check the piston for witness marks, and correspondingly the inside of the compression cylinder. If you find anything untoward, smooth it out and polish where necessary. The piston in Airsporters is made from some nasty pot-metal which doesn't take a polishing very well but it can still be smoothed.
     
  8. Barling Stu

    Barling Stu Active Member

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    Right im going to strip it and start again. First il polish the internals then order new spring top hat and spring guide and hopefully itll shoot like a dream. Is it worth polishing the trigger sears while im at it?
     
  9. Jackroadkill

    Jackroadkill Donator

    Messages:
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    Location:
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    I didn't bother with mine as the trigger was fine. I'd only bother if you feel that it could be improved significantly.

    Here's what I did to my Stutzen:

    http://www.airgunforum.co.uk/forums...nd-tune-Well-eventually?highlight=bsa+stutzen
     
  10. Barling Stu

    Barling Stu Active Member

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    Just looked at your airsporter pics and mine was much the same. I had to cut the piston head off. Whats with the gunk. The buffer had dissapeared in mine aswell and the piston head pin was bent. Just stripped it again ready for the new spring and decided to start prepping it for a re blue.
     
  11. oliver13

    oliver13 Donator

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    It's worth checking the alignment of the loading tap, there should be some shim washers at the handle side to get it spot on - shoot some pellets into a bucket of water with some rags in the bottom & check carefully that the shiny ring left by the rifling is perfect all the way round. If it's off it's easy to see.
     
  12. Patrick

    Patrick Donator

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    I thought the piston skirt was rolled from sheet steel and hardened,it seemed very hard on the BSA's I owned
     
  13. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    By my reckoning the gun's producing around 8.5ftlb.. later Airsporters have a terrible rep for low muzzle energy; due I think to a combination of poor design and poor QC. Generally I think you're considered lucky to get 9 or 10ftlb from one in .22; they were never a legal-limit gun anyway.

    I'd be inclined to leave this one alone and just enjoy it as it is :)
     

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