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Wrong Top Hat Tx200

Discussion in 'Technical' started by shergar, Oct 12, 2019 at 6:09 PM.

  1. shergar

    shergar Busy Member

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    Recently acquired gun was shooting JSB 15.89 at 580 ft/sec ,didn't feel right and this was reflected in grouping. Stripped down 25 mm preload and discovered top hat added 13 mm to spring as would be found in 177 action.
    Fitted correct top hat,reassembled, 15 mm preload had it shooting 530 ft/sec, super smooth,pellet on pellet, but power down to 9.9 fpe.
    Returning to box of bits found 6 mm front slip washer off tbt kit, installed, preload 29 mm.
    Obviously washer,21 mm diameter, was catching on something in piston. Required soak in WD 40 and vigorous tapping to remove.
    Reassembled with thin slip washer, 20 mm diameter and a couple of preload washers on guide.
    Preload 19 mm. Much surprised gun now shooting at 580 ft/sec with reduced preload. Have removed one preload washer and will see how gun settles after a tin of pellets. Accuracy still pellet on pellet.
    Thoughts are:- TBT top hat and front slip washer can be tight fit. I'd already reduced diameter of top hat from same kit when fitting to another gun. The slip washers added 4 mm of preload ,
    15 mm to 19 mm, this alone should not have pushed power from 9.9 to 11.8 fpe.
    Was grease in the piston masking power until washed out by WD 40.
    The gun showed no sign of previous work,did it leave factory with wrong top hat.
     
    walter Often likes this.
  2. Tinbum

    Tinbum Delusions of adequacy

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    That am a whole heap um question!:confused:

    AA have many different sized top hats that are used with regard to spring performance rather than calibre. The whole .177/.22 thing is a misnomer.

    All I'd say is tinkering almost always improves matters:D
     
    shergar likes this.
  3. walter Often

    walter Often Posting Addict

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    That's a good write up that. Stuff like this really interests me. Nice one.
     
    Tyler durdon and shergar like this.
  4. john79

    john79 Keyboard Hero

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    my tx200 .177 is very sensitive to preload...if I added 4mm it would increase power by over 1 f/lb easy , I have only TbT spring guide ,top hat and slip washer mk3 spring no other washers and power is bang on 11 f/lb's
     
    Tyler durdon and shergar like this.
  5. Tyler durdon

    Tyler durdon Posting Addict

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    My prosport hat a 13mm top hat in 177
     
    shergar likes this.
  6. shergar

    shergar Busy Member

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    My Tx200 in 177 has the 13 mm top hat and in that calibre it feels fine, had assumed it was to compensate between calibres. If AA are using them irrespective of calibre it's doing them no favours. Probably why gun came back on the market, with seller thinking AA are over rated. Thanks to advice from all on here it's getting sorted.
    Didn't mention in OP that piston seal is also tight but when fixed gun will live up to marketing hype.
     
    Tyler durdon and john79 like this.
  7. FPoole

    FPoole Posting Addict

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    I have added stiffer springs and more preload and lost power. It's all about finding the right balance.
     

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