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Weihrauch Hw97 Tune/piston Mod

Discussion in 'Technical' started by mjwright1968, Mar 28, 2020.

  1. mjwright1968

    mjwright1968 Newbie

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    I bought a second hand hw97mk1 in December 2019 for a Christmas project, I have now completed this project and I am delighted with the results. TBT top hat and spring guide with short stroke reducer, PTFE piston sleeve and polish of all internals. I also drilled the piston to reduce weight in an effort to increase lock time and reduce the recoil. this week thanks to COVID 19 I have modified the Rekord trigger by moving the trigger forward. the rifle was good to start with but now it in a different league. your thoughts please.
     

    Attached Files:

  2. jesim1

    jesim1 Kit bitch to the Stars

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    Sounds good - have you balanced the increase in performance with resistance of the piston in the cylinder to reduce the double recoil on maximum compression? I believe this is one of the hardest things to do, so I'd be intrigued if you tackled it? Does the cycle change with different pellet weights? Mine works very well tuned, but I found using lubed light pellets made it too efficient and the cycle was actually harsher on recoil, it shoots perfectly with AA Express @ 7.9gn unlubed though :thumb:
     
    Tinbum and The Iceman like this.
  3. walter Often

    walter Often Big Poster

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    My 97 has had a lot of work done to it by Shaun. I still don't understand all the technical stuff, but I've got a rough idea of why it is as it is now. It's amazing with any pellet I've tested with so far, but with the tighter fitting hn ftt, it sounds and feels slightly different to the "drop in" RS. the hn ftt are still accurate, but the RS are siky smooth and very quiet.
     
    jesim1 likes this.
  4. Tinbum

    Tinbum Delusions of adequacy

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    Good job!:thumb:
     
  5. walter Often

    walter Often Big Poster

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    The only thing I still struggle with is loading the pellet. I hold the cocking arm in one hand cos I've read that its risky not to, but I'm like a cow handcuffed trying to fumble the pellets in. I think I've finally sussed it, then the next day I'm back to square one. Turning it upside down to shake the pellet out. The wife keeps finding pellets from everywhere I shoot it from. Deffo easier to load a break barrel.
     
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  6. jesim1

    jesim1 Kit bitch to the Stars

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    Left hand holds open the cocking arm and steadies the gun, the butt pad sits on your right knee with the scope slightly against you for support, then you just pop in the pellet with the thumb of your right hand :thumb:
     
    Reevo17 likes this.
  7. Plinky Dave

    Plinky Dave Engaging Member

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    Looking really well done, how did you get the holes drilled in the piston, pillar drill? and is there a explanation or instruction on how to move the trigger pivot and by how much? I guess this improves trigger feel. A piccy of the modded trigger assy would be useful.
    Thanks
    Dave
     
    Howlin Wolf likes this.
  8. john79

    john79 Big Poster

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    [​IMG]
     
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  9. Blackmax

    Blackmax Forum Rude Guy

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    Nice work buddy! :up:
     
  10. walter Often

    walter Often Big Poster

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    How you have described that is spot on. Everything except the bit where I put the pellet in! Lol! The end of the scope is half inch back from where you load it, and not covering anything at all. So I experimented by taking the scope completely off. It worked. It was a lot easier with out the scope on. But obviously that isn't practical. So cos I'm bored, and I've already walked the dog twice today,.......I'm gonna delve into the wifes sewing box and see what I can do to help me with the loading problem. Something likes this maybe......?;):D

    "THE DEVIL FINDS WORK FOR IDLE HANDS" 15854848401346756007958205429278.jpg
     
    pjgtech, Tyler durdon and whambam like this.
  11. whambam

    whambam Lost in a world of bulls##t

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    Looks good
     
  12. walter Often

    walter Often Big Poster

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    Lol! I'm pacing up and down constantly looking for something to do mate. The wife is looking a bit nervous. She likes our place as it is. She doesn't want an underground bunker in the garden with a tunnel leading to the beer shop a mile away. And has hidden all my camping tarps cos she said I had a nightmare last night and was muttering about building a hang glider and launch pad next to the chimney. :):confused:
     
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  13. jesim1

    jesim1 Kit bitch to the Stars

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    I tried several scopes on mine to get decent access to the loading port, so keep trying. I've currently got an Aztec Emerald 5-25 on there and it's fine, I also tried a Sidewinder, Airmax, Endurance and they were all doable but not quite as easy, you can't just measure the scopes as eye relief plays a part also, and the inch or so between the scope arrestor pin hols also comes into it. But basically, a shorter scope will give you more room :thumb:
     
  14. walter Often

    walter Often Big Poster

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    Nice one mate. I totally get the bit about setting the scope back as far as it will go. I put it in the furthest away hole this morning, but like you say,.....it was no good for me when I looked through it. So it's back in the middle. I've got these other two scopes that I've had for years. Maybe I'll try these to see if they are any good. 15854861960641537668856453897476.jpg
     
  15. Plinky Dave

    Plinky Dave Engaging Member

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    Thanks, looks pretty straightforward: strip trigger assy, Mark approx 3mm fwd of existing hole, centerpunch and drill pilot, open to 2mm, repeat on backside, de burr, clean and reassemble. Looks like the 1st stage tang has gone too.
    Hmm, if only I had loads of free time.
    Dave
     
    john79 likes this.
  16. jesim1

    jesim1 Kit bitch to the Stars

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    A scope that fits is infinitely better than one which does not :thumb::D
     
    Howlin Wolf likes this.
  17. walter Often

    walter Often Big Poster

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    I learnt that with the shoes handed down to me as a kid. I tried one of the smaller ones earlier, but the one piece mount was too low. The scope cleared the top of the gun by about 5mm, but I had to twist my neck in a figure of eight shape , and take my eyeball out to see through it. The hawke is back in business again now.
     
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  18. Tyler durdon

    Tyler durdon Big Poster

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    Why don’t you refinish your stock mate , that will keep you busy.
     
  19. walter Often

    walter Often Big Poster

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    I look at the stock often mate. It's got a big scratch on one side just back from where I hold it. Looks like someone had a go at it once? Only visible in certain light though. It's got a couple of tiny dinks and knocks in places, but again, only really seen in the right light. I'm not skilled at stuff like that Steve. I wouldn't know where to begin mate. It's got a plain finish to it. The only chequering is one each side of the trigger. I won't be getting the dremel or a chisel out though. I'll end up with a nice open fire in the garden, and a naked 97 action.
     
  20. Tyler durdon

    Tyler durdon Big Poster

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    You could do it mate , nothing fancy just light hand sanding and some finish , I’ll walk you through it just pm me pal
    Atb
    Steve
     
    walter Often likes this.

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