Brand new HW77 .177 - how to fix the twang?

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RödW

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Hi guys,

I’ve seen various posts about spring twang but mostly on older & or modified guns.

I have a brand new .177 model HW77 which is my first springer since the 70s. I wanted to enter the springer cup at my club and it’s also a bit of nostalgia from my youth. It’s in the laminate stock too and now also with a cheek riser care of @nobby it fits like a glove.

It shoots well but makes one hell of a twang. Having heard other springers at the club it’s a lot noisier than anything else I’ve heard including other HW77s. Any recommendations for how to sort this on a new gun?
 
My friend, you'll have to disassemble the rifle and access the spring.
Adjust the guide and the spring sleeve. If the spring is making noise, it means there's play.
You'll also have to file down any rough edges on the spring. Also, use a suitable top hat, ensure the guide is properly adjusted, apply some grease, and check it.

A good, complete kit is also the best advice.👍👍
 
RödW said:
Which kit, I’m assuming the standard spring doesn’t need replacing already or does it?
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One of the fine forum members can turn you up a set of bespoke guides/ top hat for your existing spring...a factory spring should at least see you through 10,000 shots + .👍
Place a wanted ad.
 
Easiest and quickest way to stop the twang is make piston sleeve out of a plastic milk carton , easy to make( YouTube video for guidence ). Nice dollop of moly grease or lithium on the spring and the twang will instantly disappear , ive done this on all the weihrauchs I've ever owned 👍🏻
 
Tinbum said:
A dollop of grease and a sleeve will stop it, proper fitting guides on a decent spring will fix it!👍

Any kit will be better than standard, we do offer discounts for forum members at TbT. Drop me a pm with what you want or any questions🙂
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Cheers Nick, I've watched a good few of your videos now and am rapidly coming to the conclusion. I've got a springer comp this weekend, let me get that out of the way while the gun is shooting well and I'll be in touch for a kit.
 
Before you fit a sleeve, take a look at ARC Tuning Facebook page. Lyn has a video of what looks like a plastic sleeve which has migrated and twisted inside a piston and snagged on the spring. Something to make you think.

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Moosequito said:
Before you fit a sleeve, take a look at ARC Tuning Facebook page. Lyn has a video of what looks like a plastic sleeve which has migrated and twisted inside a piston and snagged on the spring. Something to make you think.

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Yep, agreed that looks like a right mess. Looks like I'm going down the TBT kit route now.
 
RödW said:
I've got a springer comp this weekend, let me get that out of the way while the gun is shooting well and I'll be in touch for a kit.
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A friend who was a top PCP repairer/tuner bought an oldish HW77. With it, he downed just about every HFT target he shot in club competitions, but it twanged, so he decided to 'fix' it. After fixing it several times using special bits from recognised tuners, each of which cured the twang but made the rifle way less accurate, he sold it.

The twang happens because the spring's natural resonance frequency is excited by the shot cycle, notably the compression stroke timing; if left to its own devices, creep in the spring can alter that timing, so the twang can disappear, though most prefer to dampen the resonance using well fitting spring guides, or a synthetic piston sleeve, or even a thin coating of fairly viscous grease on the spring might do the trick.

On the other hand, if it's shooting well and used for target work (rather than hunting where the sound of a twang can be an issue) I'd be inclined to leave it as is.
 
Plastic piston sleeves don't last long they move about in the piston and wear fairly quickly. Correctly fitting spring guides nicely finished spring ends remove any burs on the cocking lever slot and polish the piston and a light coating of moly grease on the spring. This will improve the shot cycle and should remove the twang. I apply moly grease with a small paint brush.
 
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