Hatsan Flash hammer spring adjustment?

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mcoulter

mcoulter

Member
Dec 16, 2015
1,175
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Syracuse, NY, USA
Has anyone played with the Hatsan Flash hammer spring adjustment yet? I got my .177 yesterday and shot a few strings. 

The shot curve is steep. Really steep. So it's time to play. 

Unfortunately, I don't have any allen wrenches long enough to reach into where I assume the hammer spring adjustment it - and this is my 1st hatsan pcp... I'd like to get confirmation from someone who has worked on one of these that this lower hole (with two smaller holes on the sides) is where this HS adjustment is:



1530826534_20617467415b3e8f2654ac56.37477813_20180705_173012.jpg




1530826580_16727828625b3e8f5427fed8.83042901_hatsan string1 (1).PNG




Thanks!
 
Have you contacted Hatsan Technical? I have a Sortie and Barrage and they were very helpful in telling me what to try over the phone. My Sortie and Barrage take a 4 mm allen wrench and it goes in about 30 mm to make contact. There also is a set screw that must be loosened before you can make any adjustment. The bolt must be closed to reach these set screws.
 
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Looks like you figured it out - there are 15 turns between fully CW and fully CCW on the hammer spring pretension adjustment. This spring tensioning works opposite to that of the Gamo Urban - you turn it CW to lower the pretension and CCW to increase it. I picked up a refurb .25 cal last week and it came set at 11.5 turns CCW (nearly full power) with a similar falling shot curve like yours had. It came putting out over 45 fpe for the first few shots. I have it set at 4.5 turns CCW now and it gives me 24 nice shots - maybe a touch slow, but shooting very nicely.

1533870060_14533897405b6cffece8cd92.89447768_Flash-4.5turns-.25cal-28.4grBHE-200bar-to-100bar.jpg

 
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Yup, and things have improved a bit more. It has been awhile since I have updated this information.

Here is the string for 4 turns out (CCW) shooting .177 Crosman Premiere Ultra Magnum pellets. This is 3 magazines / 42 shots. 2900 psi start and 1812 end psi.

1537981304_5648520295babbb783ad281.06959870_flash 4hs 3mags.PNG




And now 5 turns out with the same pellet. But this is 2 magazines / 28 shots. 2900 psi start and 2175 end psi.

1537981346_9681430935babbba24ae5b8.55454739_flash 5hs 2mags.PNG




And yes, I should really just fire the 1st shot of the fill into the ground :)




 
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Hi @GiveEmLead, 

A magazine's worth of shots really isn't that many... How is your accuracy now? Is it meeting your expectations for that number of shots? Do you have a chonograph to check your guns's performance? If you do have a chrony want to play, changing the hammer spring is easy and if you do it carefully, you can return the gun to its original performance very easily.
 
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I realize this is a year-old thread, but I just ordered a Flashpup in .22 after trying out my friend's .25 and falling in love with it. (it will be my first PCP gun). I'm curious about the procedure for tuning. Does one leave the gun disassembled on the bench and take shots through the crony, or do you adjust one turn, reassemble the gun then shoot a mag or two, then disassemble the gun, adjust another turn, reassemble, refill, and then shoot another string?

Also did I read correctly that you can adjust the hammer spring EITHER WAY while the gun is filled?
 
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Hey, congrats on your purchase! My suggestion is to shoot it a bunch as-is to get a baseline and se how the gun feels. Off the cuff, 3-4 fills. Then get serious with the chrony. I did both but eventually settled on doing most of my tuning with the stock off (mind you I had the flash and not the flashpup so being mindful of any linkage is going to be paramount for safety with the gun stock off). And yes when it comes to hammer spring adjustment, you can adjust them both up and down without any issue when the gun is filled. Just be mindful that there is a small grub screw that you need to loosen when adjusting the gun (again, I assume this is consistent between the pup and standard flash).

You can see this HS locking screw in the pic here below the where the bolt slides:

20180711_185527.1603236391.jpg

 
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