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best tuning kit question

Discussion in 'Anything Airgun Related' started by gazzer42, Jan 25, 2014.

  1. gazzer42

    gazzer42 Active Member

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    Hi all. I have just bought a 1989 HW77 in .22 as a restoration project . First of hopefully many. Just wondering what would be the best tuning kit for this rifle , whether it be V Mach , Welsh Willys ect. Any thoughts would be much appreciated. Thanks. Gazz
     
  2. stevemandm

    stevemandm Honorary Member

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    cant comment on the others gazz, but i highly recommend the welsh willy kit. he's a v friendly and knowlegable guy, who's also a forum member.
    his knowlege and customer service is a reason in itself to deal with him.
     
  3. 177

    177 Donator

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    Cost wise there's nothing really in it when you factor the piston seal in.

    WW kits don't come with a piton seal.

    V-Mach kits do.

    The added cost of the seal means there's nothing between the kits as far as your wallet is concerned.

    If I may, why are you looking for a tuning kit and what do you hope to gain ?

    I only ask because if ever there was a gun that was easy to home tune it's the HW77.

    I have a 25mm piston one from years ago that looks rough on the outside but it's my sleeper gun. Every time I take it to the range (purely out of mischief) I get asked about it because it can print such tiny groups and spinner after spinner gets nailed.

    The 'smile factor' kicks in each time I hand it over to someone with an offer to 'have a go if you like'.

    First comment (after their jaw drops) is how smooth, quiet and easy the gun is to cock.

    The second comment is usually unprintable due to the variations on whatever profanity the shooter chooses to include in their expression of amazement and wonder :rolleyes:

    Mine has a sized Weihrauch piston seal, a shortened Titan mainspring, factory spring guide (polished) and a delrin top hat. Transfer port is opened out a little too and the piston has ten 1/4" holes drilled into it to lighten it.

    The work went into polishing and lube.

    Compression tube and piston are mirror polished.

    Mainspring, compression tube and the front and back inch or so of the piston are lubed with Ultimox 226.

    Spring guide is lubed with Dri-Slide.

    It cocks like it's on bearings and has a very 'dead' feel when shot, without the bounce you often get, especially compared with a V-Mach kit.

    I always chuckle when people ask who tuned it and how much it cost :)

    Stuart shot it a couple of weeks ago at Swarland Range and immediately offered to buy it ;)

    it's performance is all the more satisfying given the faded blueing on the barrel and cocking lever, and the dings in the stock. Folks always take it slightly reluctantly, assuming it's a dog :cool:

    Anyhoo, if you want a kit the WW ones are better value if your current piston seal is in good shape. The last couple of V-Mach kits I've had needed a lot of sizing on the piston seal which was far too big for the gun it was going in (both HW95 kits).

    If it was mine, I'd do a lot of polishing, get some decent lube on it, and sit back with the morally superior expression that only comes by doing it yourself with the potential of at least as good results as any kit can offer.

    My old sleeper HW77 at Stuart's range a couple of weeks ago in freezing and windy conditions, 10 shots @ 25 metres using .22 JSB Exact:

    [​IMG]

    :cool: :D
     
  4. neiled

    neiled Donator

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    Very interesting on what you've done. Do you have a link or something to show how this is done as I've just put a MK1 25mm HW77K in the for sale section and if it doesn't sell then I might have a go at doing this myself (I've never done any restoration work before)?
     
  5. Jackroadkill

    Jackroadkill Donator

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    I like the WW kits. I've fitted five or six of them now and I have to say that they're very good. They're also a very good introduction to springer tuning.
     
  6. 177

    177 Donator

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    There's tons of information our there if you Google for it.

    I will try to get the time to write up what I did but basically it's outlined in enough detail above to get you going.

    Don't monkey on with the transfer port unless you know what you're doing.

    You need to balance out a lot of factors to get the right benefit from opening up the transfer port and if you get it wrong it's the quickest way to stuff your gun's performance that I know of...

    You also need access to a chrono otherwise don't even think about starting on with a tuning kit or a home-rolled tune.

    You need to test your results and without a chrono you have no way of knowing whether you made a difference or, worse, whether you made too much of a difference.

    My old HW77 is set at 11.1 FPE and it shoots beautifully at that level.

    Remember that 12 FPE is a limit to work within, not a target to try and reach.

    </end-sermon>

    :rolleyes: :D

    Seriously, just polishing the compression tube and piston then reassemble with the right lube will be a game changer. Polish the spring ends as well and, even without a top hat, you are well on your way.

    I did my mate's HW77 for him and it's all stock internals - no parts were changed, they were just polished to within an inch of begging for more and lubed with go-faster grease and it shoots at least as well as any gun I've handled with a tuning kit fitted.
     
  7. neiled

    neiled Donator

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    Thanks again 177 but what do you actually mean by polishing? Is it literally rubbing away with a cloth or do you use a special polish or compound (did I say I'm new to all this tuning /rebuilding as all I've done previously is use the guns)?
     
  8. Jackroadkill

    Jackroadkill Donator

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    Very true; my HW95 does just over 10 fpe but is incredibly smooth and stupidly accurate. Accuracy beats power all day long.
     

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