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Another Hw97k Question

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

  1. Curlyhunter.22

    Curlyhunter.22 Better to be p****d off the p****d on.

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    I read sometimes they do have a washer in, cant remember why though bit not an o ring... maybe to hold it in place?

    I have fitted tbt maxi kits to my 97 and 77 to great effect and the 97 is short stroked by 8mm too

    I use a plastic milk bottle for my piston sleeves works well.

    The 'bear trap' on these can be left off as they are not a proper one they only stop the trigger pull... if the cocking lever breaks, the piston and comp tube will have your finger off.
    Mine broke but luckily it was on cocking stroke so no damage to digits.

    When stripping check it for hairline cracks around the 90° that fits inside the comp tube.

    This stops a little rattling too.

    CC
     
    RobTaylor likes this.
  2. Blackmax

    Blackmax Forum Rude Guy

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    Remove the washer as it adds weight to the piston, the O ring will also get in the way of the top hat and Delrin washer.

    Did you actually get an official TBT kit, some of them on eBay are just copies of Nicks kits and won't necessarily fit correctly.

    As for the piston sleeve, don't use PTFE as it doesn't last, as the spring compresses it'll rub on it and it'll break up in no time. Someone said about the piston sleeve stopping the twang, it won't, a properly fitted spring guide will.
     
    RobTaylor likes this.
  3. Sean110

    Sean110 Engaging Member

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    I had one in mine. 10mm weight. The washers i got in my kit replaced that but i had to add more to up the power as it was a tad low.

    Look at nicks videos on Youtube as youll have to shorten the spring guide slightly as it will not cock due to the extra washers, happened to mine anyway.

    .
     
    RobTaylor likes this.
  4. shauny

    shauny Top Poster

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    if you have a 97 spring fitted into something like an 8o piston(stick in a bucket) doesnt matter how well the guides fit,if the spring has got too much lateral play(or room between outside of spring and inside of piston) it will be able to wobble/vibrate/resonate or what ever you want to call
    twang. ptfe is ok in some springers,not in others. a ptfe or ali sleeve in a 99 doesnt last long as it gets rubbed by the cocking foot,but in the 97
    it seems to be ok.ive not had issues with ptfe in 97s,and also had several paul short tuned 97s to bits,which utilise a ptfe liner. if not
    enough room for ptfe in a 97 ,a steel liner also good
     
  5. RobTaylor

    RobTaylor Engaging Member

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    Thanks everyone. I'll remove the washer and o ring tonight.
     
  6. RobTaylor

    RobTaylor Engaging Member

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    Yes. Definitely an official one with the sticker inside etc.
    The kit fits perfectly, just wasn't sure about the original washer in there.
     
    Blackmax likes this.
  7. Gary Jones

    Gary Jones Big Poster

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    I had about 3 extra washers in my 97k mate all different thicknesses. I asked the same question as you and the consensus was bin them.

    I had a vmach kit though which comprised of a full kit including spring. If your using the existing spring and just adding a guide and tophat you may need to keep them washers in there but I'd hazard a guess as to that you wont need to.
     
    RobTaylor likes this.
  8. RobTaylor

    RobTaylor Engaging Member

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    Though I haven't measured the washer, it looks about the same thickness as the plastic slip washer that goes in front of the top hat so I reckon the pre load should be the same if I bin the metal one.
    So why have some got these and some not? Poorly cut springs maybe and washer to make up for the difference?
     
    Blackmax likes this.
  9. Tyler durdon

    Tyler durdon Keyboard Hero

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    My 77 did remove the o ring and the washer will slide out
     
    RobTaylor and Blackmax like this.
  10. RobTaylor

    RobTaylor Engaging Member

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    All back together with the tinbum kit installed. Bit of a polish etc. Fired about 30 pellets through it and having a few accuracy issues here. Nothing major, but not as tight as before. Do I need to wait for the spring to settle down as if it was new?
     
  11. Tyler durdon

    Tyler durdon Keyboard Hero

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    Might take a few shots pal . Was the piston seal in good nick or did you fit a new one ?have you checked the power ?
     
    Blackmax and RobTaylor like this.
  12. shauny

    shauny Top Poster

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    when you have had it to bits,do a bit of plinking for a couple of hundred shots,this should be enough for it to spit out any surplus lube/grease,
    then give the barrel a clean.:thumb:
     
  13. RobTaylor

    RobTaylor Engaging Member

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    Cool. Just being impatient I guess. I haven't checked the power yet but will as soon as someone takes a chrono down the club, though I've used the original spring.
    Seals were good.
     
  14. Tyler durdon

    Tyler durdon Keyboard Hero

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    Just a bit of use then ,all should be good enjoy!
     
    RobTaylor likes this.
  15. RobTaylor

    RobTaylor Engaging Member

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    Job done. Short range but back to pellet on pellet. The interesting thing is, the superfields by rws are coming out the tightest now. Tighter groups than my usual accupels. May have to switch over to these. I'll see how they perform at 30 metres.
     
  16. whambam

    whambam Posting Addict

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    How do you get the free postage just looking at buying some kits

    Thank you
     
  17. Tinbum

    Tinbum Delusions of adequacy

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    Either ring the order through or pm me when you've done it and I'll refund the post;)
     
  18. whambam

    whambam Posting Addict

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    Cool will order now thank you
     
    Tinbum likes this.
  19. telephonepete

    telephonepete Donator

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    I dont use piston liners any more. A well fitting spring guide stops any twang just a thud on firing. If you send your spring to Nick he will fit the guide to your spring.
     
    Blackmax likes this.
  20. Tinbum

    Tinbum Delusions of adequacy

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    Got it and refunded! While I was there I saw there were a few other orders from forum members this weekend. I have refunded those postages too, but please let me know guys! I would hate to miss someone:)
     
    Blackmax likes this.

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