hw 90

[Lewdan 17]

My son-in-law has a HW 90 fitted with the theoben gas ram system, it had not been used for a number of years but when he recently checked it ( with chrono ) it was down on power 7.2ft/lbs, rifle was taken to local dealer who re-charged the ram, problem is that since this has been done he cannot get any consistant groups on targets ( with any type of pellet ). Would it be viable to replace the gas ram with a spring, or is the only option a new gas- ram? the rifle itself is in excellent condition.

Any advice please .

LD

[johnbaz 363]

My son-in-law has a HW 90 fitted with the theoben gas ram system, it had not been used for a number of years but when he recently checked it ( with chrono ) it was down on power 7.2ft/lbs, rifle was taken to local dealer who re-charged the ram, problem is that since this has been done he cannot get any consistant groups on targets ( with any type of pellet ). Would it be viable to replace the gas ram with a spring, or is the only option a new gas- ram? the rifle itself is in excellent condition.

Any advice please .

LD

 

Hi Lewdan

 

All HW90's are gas rammed, i've never heard of one being changed to a spring powered and am not sure if it can be done or not

 

Have to tried cleaning the barrel in case there's any rust of crud in there??

 

What did the recharge take the rifle up to??

 

It's also possible that it may need running in to get the gun to settle down if it wasn't used much originally

 

I have a Gamo Stutzen rifle that was awful at first, once i'd shot a tin of pellets (500) through it the gun settled down brilliantly

 

 

I'm actually buying a hw90 in a few weeks time (can't wait!!!)

 

 

Good luck with your gun, i'm sure someone will be along soon to say whether it's possible to convert it to spring

 

 

Cheers, John

Edited December 30, 2011 by johnbaz

[*Ross 4]

Have you checked the action is screwed into the stock nice and tight?

[graham4877 1,181]

new seals, breech seal, gas strut seals, tighten the barrel/breech as it dose like to slip down!! failing that take it back to the shop as tell them to fix is as the may of down something!

[firebird91 0]

If they al fail [bANNED TEXT] check airgunbuyer.co.uk they selk gas rams nit bad price eva

[andyfr1968 772]

If the ram's fecked you can take it out and fit a steel spring from the HW80, it uses the existing piston with the ram's inner strut removed. Make sure the ram's fully de-gassed before though otherwise it'll go very badly for you......

 

As above, make sure all that needs to be tight is. They don't like being left idle for long periods, my 90 once did exactly the same thing after a long lay up. Is the gun dieseling? They can be quite prone to that when running at full pressure and that will naff up it's accuracy big style.

 

Good luck with it and let us know how you get on

[graham4877 1,181]

yea hw80 piston head fits 90 , jet new seals for the gas strut its self! as its two piece think you have 3 seals in side the strut,

if a jobs worth doing and all that!

[hugo1 31]

you can get them changed to a spring ive got one with a spring and it doing11.4ft/lds