Hatsan AT44 Power Tuning

[McCrumbs]

I have a Hatsan AT44-10 QE Long .25 that I'm trying to tune down the power. I've tried using Airgun Web's method on YouTube (https://youtu.be/QrNgOqfIqLs?t=4m). That method didn't make a difference from what I can tell. Then I tried this method (https://youtu.be/ag2ziKYvnqA?t=36s). The problem with the second method is, I can't turn the allen key with something holding the hammer from turning.

Does anyone know if Hatsan ships their AT44s at the lowest power setting? I guess it's time to order a chrony to see if it actually is tuning it down. However, it still consumes just as much air as it did before I turned it a billion times to lower the power.

 

[dark1961]

Does the first procedure/video also apply to a BT65, 30 cal?

 

[kelly1]

Does the first procedure/video also apply to a BT65, 30 cal?

To adjust the hammer you need to remove the gun from the stock. Make sure the gun isn't cocked

You need the long Allen key inserted in the preload adjuster. 

look for a small hole (roughly q/8inch) under the action about where the hammer would be.

insert a long 1/16 Allen start adjusting hammer until Allen drops into hammer and locks it in place. 

Counter clockwise increases preload, clockwise decreases. 

To make major power change, plug valve ports try leaving 2 or 3 open or change out valve pin in the air tube.. kelly

 

[kelly1]

Does the first procedure/video also apply to a BT65, 30 cal?

mod please delete duplicates thx

 

[kelly1]

 

[Stefanjan]

Hatsan does not ship with the lowest power setting. Actually they ship at almost the highest. I turned my 177 down a bit and didnt notice a big air savings. Went from 35 to 40 shots before they fall off. I used Airgun web method. You need a loooooong allen key. I want to say 5 to 6 inches. Amazon has the regulators at like $70. But watch them as yesterday they dropped to $49 for a couple hours (I didnt grab one in time but I will next time). You can also plug the ports but im not sure how to do that. I had a .25 cal for a very short time and I could only get 18 shots on a tank. (Tack version with short tank).

 

[McCrumbs]

Maybe the .25 can't be tuned? I have a chronograph now, and it makes no difference what I do. I can turn the thing all day clockwise -- nothing happens to the fps.

 

[Mrshosted]

Go to "gateway to airguns and search Bob's mod at44" all your question will be answered there

 

[McCrumbs]

Go to "gateway to airguns and search Bob's mod at44" all your question will be answered there

That forum won't allow me to use the search. I'll try to find it another way I guess.

 

[d3vnull]

Go to "gateway to airguns and search Bob's mod at44" all your question will be answered there

That forum won't allow me to use the search. I'll try to find it another way I guess.

Try this google foo:

GTA search

 

[McCrumbs]

I'm just going to try and force the screw to turn. According to an email response from Hatsan, you need to do it just like the second video. My screw doesn't want to turn, but I guess I really need to crank that sucker. I'm not looking to do crazy modding to the thing.

 

[PPJL]

Hi!
I have a HATSAN AT 44-10 S rifle, I can't raise the power above 6.5 Joules according to video 2. The screw is fully screwed in, it can be reduced down to 5.3J. what is the reason? (I use Google translate!)

 

[Pale_Rider]

Mcrumbs, Sounds like there is a set screw preventing it from turning(that’s how it is on my bt65). Inspect all around the tube where the hammer spring is, there should be a small hex screw. Loosen that screw before you adjust hammer spring.

I’m assuming the AT44 has a unnecessarily heavy hammer like the bt65. If the hammer looks anything like the bt65 you can drill holes in it to remove some of the weight. That should improve your air consumption and get you to a lower power.

As for plugging the valve holes, I’ve seen other guys tap each hole (except for one that lines up with transfer port)then put socket screws in them. After that’s done, enlarge the remaining hole and put epoxy around the area where the holes are plugged to seal them completely.

 

[kelly1]

For some of you a spare tube would be a great option ,just change it when you need the power change,kelly

 

[PPJL]

Nekem a Google fordító nem ad pontos információt, én úgy vélem, nagyobb kalapácsütésre lenne szükség a nagyobb Joule elérésére? Nem? Hiszen amikor növelem a kalapácsrúgó erejét, nő az ütési erő is? Esetleg a légtartály szeleprúgóját kell gyengíteni? Az említett beállítócsavart megkeresem, még nincs szétszedve a puska!A szelepfuratok dolgot nem értem, hol vannak ezek a furatok?