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Another Hw97k Question

Discussion in 'Technical' started by RobTaylor, Sep 12, 2019.

  1. RobTaylor

    RobTaylor Engaging Member

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    Location:
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    Hello all.

    I have really fallen in love with my 97kt recently (lightning out of action for a while) but the twang is really starting to annoy me now. Happy with the power and accuracy.
    I was looking at a cheap tbt kit on ebay for about £25. Has the spring guides and spacers. Has anyone used one of these kits and does it eliminate the twang?
    Also, I've read on here that making a sleeve from ptfe sheet quietens it down too.
    Would I still need the ptfe if I put the tbt guides in?
     
  2. the logun-ator

    the logun-ator "can i,? wey aye man!"

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    spring guides do quieten it down slightly but to deaden it you need to sleeve it
    ive done it with all my springers
    PTFE sheats from the bay are less than a fiver for a A4 sized you just need to make sure youve got the space to fit them
    0.5 and 0.25 ,ive both.
    start to Finnish the job will take 10 mins
    you WILL be pleased with the results.
     
    Tyler durdon, SeanE and RobTaylor like this.
  3. Vangard

    Vangard Busy Member

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    I have the tbt drop in kit and it made the shot cycle very nice indeed in my .177 kt. But I still had some twang (not a lot) so I have sleeved the piston with ptfe.
    This makes it much more quiet, so much so I am going to do it to my other 97kt in .22 even though that one is not as bad.
     
    Tyler durdon and RobTaylor like this.
  4. RobTaylor

    RobTaylor Engaging Member

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    Right ok. Well for the price of ptfe sheet, I may as well put a sleeve in while I'm at it then. Thanks
     
    Brad75 likes this.
  5. Gaz2121

    Gaz2121 Gazza

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    If that drop in kit from EBay is the one I tried it will need a lot of work to get it to fit .
    I had to take quite a bit off the diameter to get it to fit my spring and piston . Go for a TBT kit for an extra fiver .
     
    Patton and RobTaylor like this.
  6. Deejayuu

    Deejayuu Donator

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    Good info. so far. Would like to remind you to check spring for snug fit onto guide too. Sleeving the guide may also be useful.
     
    RobTaylor likes this.
  7. RobTaylor

    RobTaylor Engaging Member

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    It's the tbt kit I'm looking at. The basic kit.
     
  8. shauny

    shauny Top Poster

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    drop in kits are ok ,if they fit.there is too much variation on spring ids to get a nice fit in all springs they are supposed to fit.
     
    Tyler durdon, Blackmax and RobTaylor like this.
  9. the logun-ator

    the logun-ator "can i,? wey aye man!"

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    Location:
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    Yea I've found the same.
    Im lucky enough to have a small lathe/mill so I make them and other stuff my self for a fraction of the cost of buying ready made items
     
    Tyler durdon, Patton and shauny like this.
  10. monsta41

    monsta41 Donator

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    if you order it through here or on his website http://www.airrifletuning.com/ @Tinbum does free delivery for forum members
     
    Blackmax and RobTaylor like this.
  11. RobTaylor

    RobTaylor Engaging Member

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    Too late, ordered this morning with a suppressor kit. Still only a few quid delivery though but good to know for future reference.
     
  12. Jester

    Jester Rhubarb

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    I believe Tinbum will refund the postage if you make your membership known.
     
    Tinbum, monsta41 and RobTaylor like this.
  13. Jester

    Jester Rhubarb

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    I dont suppose you took measurements before final fitting? Might save a few people some time :)
     
  14. RobTaylor

    RobTaylor Engaging Member

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    I'll send him a message. Be a great result if I get free postage. Cheers
     
  15. the logun-ator

    the logun-ator "can i,? wey aye man!"

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    it all depends on the gap between the outside of the spring and the inner piston wall weather you need 0.5 or 0.25mm PTFE
    All mine were different
    easy way to do it is buy both sizes,as mentioned i did all mine,even smoothed ones that didnt twang
    mark the spring/coil just as it enters the back of the piston
    remove the spring,wrap the PTFE sheet round it,cut to the required length+5mm
    cut to the right size round so it doesnt overlap
    cut 5mm teeth bellow like so /\/\/\/\/\ this bends round the spring to hold it in the bottom against the piston
    push it in,mark any overlap with marker pen and trim
    Finnish with a small grape sized dollop of some medium weight grease all over the spring and the jobs a goodn.
     
    Vangard and Jester like this.
  16. Jester

    Jester Rhubarb

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    Perfect, thanks for detailed info :thumb:
     
    the logun-ator likes this.
  17. Tinbum

    Tinbum Delusions of adequacy

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    Location:
    La belle France!
    Free postage is available to all forum members who buy from me direct via www.airrifletuning.com or 0800 77 20 177. ;)
     
  18. Vangard

    Vangard Busy Member

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    Thanks for that mate I couldn't have put it better myself.
     
    the logun-ator likes this.
  19. Sean110

    Sean110 Engaging Member

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    The tbt kit in mine totally silenced the twang, the only noise i get now is pulling the trigger!

    .
     
  20. RobTaylor

    RobTaylor Engaging Member

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    So, stripped it down today to put the kit in. In front of the spring was a metal washer and a small o ring that I wasn't expecting. Can't see it on any 97k diagrams, but this was bought new and hasn't been stripped before. I left it there and installed the kit anyway. Seems to fire okay, but has anyone else got this extra washer and o ring in theirs?
     
    Gary Jones likes this.

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