Hi, Crown Mk2. 22cal only couple of weeks old, straight out of box. My velocities are all over the place. Basically on my reg guage its set at 110-115bar. If I fire a shot then the reg guage drops to 100 bar. Then I fire another shot and the guage might jump to 120bar or it might stay at 100bar again until I fire another shot. Its like the reg is letting in different amounts of air. Only sometimes you can hear that squele of the plenunm filling up, other times you can't.chrono matches this jump on the gauge as speeds range from 820fps to 915fps show up in the shot string. Any ideas what to look for, has anybody had similar issues? 
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Tuning Crown Mk2 Velocity issue
- Thread starter fiestaman
- Start date
I've had this before with a new out-of-the-box gun. Maybe the reg just needs to break in a bit? If it doesn't settle down, send it back. It should have been tested by the seller.
Crusher
Crusher
Upvote 0
The gun is new, barrel needs polishing, reg to settle in, all moving parts are free flowing.
My Crown mk2 .25 came tested for the jsb 25.39 Kings by the technician at Utah Airguns. Reg pressure 115 , power wheel 24 max on transfer port. Velocity of pellet 879 fps. With a little work , I found with the reg at 138 , tp at medium, power wheel at 15 , velocity 877 , produced groups 11.41mm ctc. I did adjust the internal pre-load maxed out at 24 pw 1/2 turn back.
Ted has a really good video on tuning his Crown. Good video to watch.
One thing, new regulators in the Crown mk2 allow for decreasing without having to dump the air .
Hope this helps,
Mike
My Crown mk2 .25 came tested for the jsb 25.39 Kings by the technician at Utah Airguns. Reg pressure 115 , power wheel 24 max on transfer port. Velocity of pellet 879 fps. With a little work , I found with the reg at 138 , tp at medium, power wheel at 15 , velocity 877 , produced groups 11.41mm ctc. I did adjust the internal pre-load maxed out at 24 pw 1/2 turn back.
Ted has a really good video on tuning his Crown. Good video to watch.
One thing, new regulators in the Crown mk2 allow for decreasing without having to dump the air .
Hope this helps,
Mike
Upvote 0
On more testing this seems to only happen when the bottle gets a full fill. From 180bar and under the reg cycles correctly. When I fill to 230-250 then the reg is erratic every 2nd or 3rd shot until I reach 180ish again , then it settles and cycles 100%
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I’d say you have a bad reg, call FX and talk to a tech, they are very helpful and will help you out.
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regs bad shouldnt do that out of the box have them send a new reg 10 minute job pull front gauge out first then reg
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I stripped out reg and my washers seem different sizes and pairs are not matching. Could this cause issues? In sequence from piston up is () () () () () )
.6 .6
.6 .45
.45 .45
.45 .45
.45 .45
.40
This is the way they were in the gun
I'm unable to upload a photo
.6 .6
.6 .45
.45 .45
.45 .45
.45 .45
.40
This is the way they were in the gun
I'm unable to upload a photo
Upvote 0