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short stroking an hw97k .177 worth it or not

Discussion in 'Anything Airgun Related' started by valboskie, May 25, 2015.

  1. valboskie

    valboskie Busy Member

    Messages:
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    Location:
    Greenock Renfrewshire Scotland
    I have just bought a secondhand hw97k in .177 it's from 2002.
    It is twangy to shoot and when I opened it up the spring had just been chopped .
    It was not compressed then flattened.*
    The trigger was full of factory grease.*
    The rifle has never been open since new.

    I have had 2 short stroked tx200 mk3s one in .22 the other in .177
    I was talking to Neil who has a short stroked 97 .177 with an ultraglide done Paul Short .

    Not knowing the stroke ect of the 97 is it worth doing a short stroke with a 10mm longer piston/latch rod with titan spring with guides machined to fit with delrin bearings on the comp tube and buttons on the piston*
    Any advice or opinions would be greatly appreciated*
    Cheers
    David
     
  2. Tinbum

    Tinbum Delusions of adequacy

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    Shaun at ISP sell the latch rods for about £25 iirc. That would be the way to go if you want to try short stroking as you can easily go back if you find it wasn't worth the effort. Lightening the piston and expanding the TP bring the 26mm into 25mm performance levels as an alternative. Buttoning makes cocking smoother, but doesn't have much of an effect on the firing cycle.
     
  3. matt goodson

    matt goodson Donator

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    Location:
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    I think 77/97's in 25 or 26mm shoot best with the standard stroke to be honest. I've tried down as far as 73mm, feels too snappy to me. They arent exactly long-stroke as standard, pretty short to start with.
    Both the 25 and 26 benefit with a small weight reduction of the piston (20grams on the 25mm, 35g on the 26mm) and a slightly larger xfer port. 3.5mm seems to work well.
    Thats just what I like mind :)
     
  4. arthur john smithsplease

    arthur john smithsplease Busy Member

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    Location:
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    David, what did you think of the short stroked TX Mk3s if you don't mind my asking?

    I'm undecided about getting another TX or another 97/77 (in 22 for a change) and leaning towards the latter at the moment.

    Have you still your TXs or did you move them on?
     
  5. Nickg

    Nickg Busy Member

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    Location:
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    I have done a couple ,the easy ( cheap) way, I make a piston head to take the stroke down to the same as a 99, I put bearings on the piston ( not absolutely necessary ) and make a new guide to the same design as the hw only a better fit. they shoot very well like this , and you keep the standard spring , so as I say it doesn't cost you an arm and a leg to do.

    Or alternatively. sleeve down to whichever comp tube diameter takes your fancy, 25mm or 23mm, and make a skirtless rotating piston, modify the latch sear, and install a fixed guide to control it.

    [​IMG]
     
  6. valboskie

    valboskie Busy Member

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    Location:
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    NickG I have messaged you on Facebook .

    Arthur the tx was superb the cocking effort on th hc goes up a bit
    If I was doing a full days plinking I felt it by the end .
    Accuracy and recoil wise I really liked it and did some really nice groups.
    I found it a huge improvement over the vmach kit I had in the tx.

    I no longer have the short stroked txs I sold all my rifles to concentrate on just one rifle a brand new steyr hft I bought.
    Now I regret getting rid of my collection.
    I had quite a few nice tuned springers
    Now I'm down to the steyr the 97 and a .22 brummi longbow which I will move on as i only shoot .177 it will go in swaps section
     
  7. arthur john smithsplease

    arthur john smithsplease Busy Member

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    Thanks David.

    Enjoy the Steyr.
     

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