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Shorter Stroke Tx200

Discussion in 'Anything Airgun Related' started by imorik, Nov 21, 2018.

  1. imorik

    imorik Busy Member

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    Had a spare piston body (no latch rod) from a mk2 tx so thought I'd have a tinker. Bought a mk2 piston and mk3 comp. tube from knibbs to return my mk2 to std. spec so thought I'd go shorter. Got a new latch rod from Shaun at ISP 174mm long to flat surface that latches onto trigger sear to give 76mm stroke. What surprised me was the difference in weight between new and original mk2 pistons ...... 228g new and 242g original (bare) :eek:. With the new latch rod weighing in at 103g that would make the piston 253g bare, 256g with bearings and seal. Decided to put it on a diet (with hindsight should have tried it first :oops:) nothing more than a cheap pillar drill, 2 files and a vernier guage managed to remove 34g :). Now it's assembled just got to let the threadlock cure and I can give it a whirl.

    Seal - Macarri
    Latchrod - Custom (ISP)
    Piston body - MK2 reduced by 34g
    P1030679.JPG P1030680.JPG P1030681.JPG
     
    foxtrott and pbrown like this.
  2. T 20

    T 20 Busy Member

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    I'm over here, Dave
    You could have just fitted a Walther LGV piston, they drop straight in. ;)
     
    Blackmax and imorik like this.
  3. cooper_dan

    cooper_dan Posting Addict

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    Mk2 setup is the one :up:
    Wouldn't swap my mk2 internals for anything.
     
    Oat and imorik like this.
  4. imorik

    imorik Busy Member

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    Agreed ................ just can't help myself :D

    I know ............but where's the fun in that ;)
     
  5. michael54r

    michael54r Busy Member

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    What's the benefit of the LGV piston? is it shorter stroke or lighter? do you after change the latching rod to fit?
     
  6. T 20

    T 20 Busy Member

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    I'm over here, Dave
    The LGV piston drops straight in giving about a 76mm stroke with no modifications required other than using a TX MK2 Spring.
    The LGV piston weighs about the same as a TX MK2 piston and weight, another advantage of using the LGV piston is it gives a wider choice of piston seals as the standard 25mm Weihrauch piston seal and all the custom 25mm Weihrauch seals fit it.



    All the best Mick
     
    Robgriff1 likes this.
  7. michael54r

    michael54r Busy Member

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    Thanks, I may give this a go, where's the best place to get a LGV piston?
     
  8. T 20

    T 20 Busy Member

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    I'm over here, Dave
  9. Blackmax

    Blackmax Rebel!

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    Strange that one, I guess I'm in the minority as I prefer the MK3 out of my two.
     
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  10. michael54r

    michael54r Busy Member

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  11. T 20

    T 20 Busy Member

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    I couldn't honestly say, Michael.

    My TX came to me without the beartrap fitted and I've never bothered to fit one.




    All the best Mick
     
  12. Artfull-Bodger

    Artfull-Bodger Posting Addict

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    First mod I do on any TX200 Mk3 is the latch rod from ISP, it's such a simple job to do, then convert to HW seal and shorten the transfer port!
    Big improvement on the sluggish Mk3 internals!
     
  13. imorik

    imorik Busy Member

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    If using a mk3 comp tube it definately does not engage. Would assume with a mk2 comp tube it would engage as the comp tube has notches all along it's length (10 IIRC) as opposed to the mk3 which just has the 3 you can see.
     
  14. imorik

    imorik Busy Member

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    Well assembled and tested it ............. 730fps with exact express (9.3 ft lb). With std mk2 piston and seal it was 750 fps (9.8 ft lb). Both assembled using mk3 spring so I reckon it needs the stiffer mk2 spring (got one somewhere !). Both seals were a bit tight too so will possibly need sizing. Also got a couple of Aussie Custom seals to try out as well.
     
  15. imorik

    imorik Busy Member

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    Found the mk2 spring so decided to put standard stroke mk2 piston in it as a benchmark. 7.9 Express averaged 836 fps (12.3 ft lb). 8.3 RWS Superdomes 812 fps (12.15 ft lb).
     
    Last edited: Nov 23, 2018

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