Fx impact MK2

Forums PCP Airguns Fx impact MK2

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    tor47
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    The easiest thing to try first as already mentioned, is to turn in the valve adjuster until velocity start to drop a litle. That normaly should thight up the ES.

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    spyde82
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    Should the valve adjuster not stop the hammer so it dossent open more then you set it to? The C3 Oring is between the hammer and the valve right? Would it make a defferent then?  

    Just trying to understand the idea

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    tor47
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    The valve adjuster stops the valve pin movement after hammer has hit it, so it bounce back and close a litle earlier than it normally would. If the hammer doeas not hit with exactly the same force every time (or if the reg should not regulate the same pressure every time), the valve adjuster will help on returning and closing the valve more presisely. It can be enough to reduce the average velocity 10-20 fps with valve adjuster to thighten up the velocity spread. It should normally not be used to lower the velocity allot, as that is what the power wheel is for.

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    heavy-impact
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    C3 bumper is between the hammer and hammer seat. Valve adjuster is at the end of the hammer seat to limit travel.

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    spyde82
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    I use it for fine tuning the fps so i tryed that also

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    spyde82
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    I Got some testing done today, there are still a 30+ es after i pulles the reg and cleened it.

    why do my poi shift in groups 🤔

     

    these pictures is just a test i did not adjust any thing just shot some groups aimed at center point.

     

     

    see how the poi rotate? 

    Startet at the left upper corner to the right

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    MonsterMaxx
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    Do I see an aftermarket LDC on there?  Maybe you are clipping.

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    christian
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    You are located in Denmark right, if so, did you purchase a sub 12 fp Impact?

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    spyde82
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    Yes it is the donnyfl sumo on there, and it is not clipping, ive check that also.

     

    yes iam located in denmark but it is a .22 full power version

     

    i have orderd a huma regulator and i will change the C3 bumber aswell hoping it will solve the problem 🤷🏻‍♂️

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    spyde82
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    edosan
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    heavy-impact

    spyde82

    i am sorry you are right about the serial number.  So now i just have to figure out why the ES in fps 🥴🤭🙏🏻

    Replace the C3 bumper with a 1.5mm delrin washer. Wait at least 5 seconds between shots.

    👆 that, sound like a busted c3 bumper

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    spyde82
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    Maybe but it has Bern doing it since unboxing.  But we Will see soon

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    spyde82
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    Do any of you guys have jeg exact messurements on the c3 delrin bumber?

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    spyde82
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    Change the c3 bumber today, and it diddent help 😢.

    so all i can do now is wait on the huma regulator and hope thats the problem.

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    Scotaty
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    The regulator need few hundred shots to settle when new, rebuilt or cleaned. 

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    Skidoo165
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    Same problem with my .30 after a couple hundred rounds, was shooting perfect then went to shit, I literally backed the hammer spring off a quarter turn and it has been shooting money ever since, I now have a few thousand rounds with zero issues

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    spyde82
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    I tryed every thinkable setting. And i have shot around 2000 shots without even been able to sight it in.

     

    i tryed following ernest rowes video, i have talked to gerhard from air hunters nothing have worked.

     

    i have an ES of 30+ sometimes even up to 60fps but i am not 100% sure that it is that, thats effect my poi, but i can shoot 5-10 shot group hole in hole and the group shift poi.

     

    i tryed to shot 10 shot and record every shot over the chronograph to see if the poi shift in relation to the fps.

     

    you can see for your self

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    heavy-impact
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    Measure to be sure your pellet probe is at the correct depth… no need to disassemble the gun, just slide the butt pad down and measure.

     

     

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    spyde82
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    That was fine too.  Exacly 45mm..

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    Hobbyman2007
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    How’s the barrel O-Ring . Even if it looks good from the outside I’d pull it out to make sure it isn’t damaged. 

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