hammer spring versus valve stem versus rgulator adjustment

Could a ported valve and barrel lapping, and any other mods get you that extra 90 fps at 110 bar?

and I will be looking to get 900 fps in my .25 cricket at the lowest reg pressure also and can basically do any mod needed. What will the basic numbers need to be on my rifle to get me close?

But he wrote .22 but I can not believe the cricket could get 950fps/280mps with 110bar reggulator. Because it is cca. 885fps/270mps with 18 grain pellets and I could not get 270mps with 110bar.
With 110bar I´m able get only 860fps/260-262mps

hmhm 110bar and got 290mps@1,103gram JSB ?? That´s quite strangely. Very interesting cricket I did not hear about cricket which can get with reg 110bar@290mps…

Gee ….. … . wiz. … Thanks guys, that has to be the best compliment I’ve ever gotten on TAG !

Remember every gun is a bit different with the use of a different nanometer to measure the bar pressures.
All Crickets (hammer, valve stem and regulator) springs are somewhat different within each one.
Thus what setting that work one gun will not always work exactly the same on another, chrony stats many differ.
But the chrony velocity numbers you get are the best guide lines to follow.

Other than that the above worked great on 4 cricket 22 standard so far.

NOw that’s what I’m talking about !
That’s great news tejani good job, now you know your Cricket better then anyone !

At 110 bar it sound like a 22 cal, if so are you getting good accuracy at 290mps ?
290mps = 950fps you never mention the caliber, is it a 25 cal ?

~ ATB ~ GKU

Yes! What I was thinking also!

I stole his posts and dropped them all in a Word document to save for later… I got me a Reg. Tester coming and got springs, o-ring kit, degasser, etc. from Ernest… Hope I can get this tuning thing down right… Worse case scenario, if I get it all messed up, I will send the gun back to Earnest to straighten it out again…

Okay, looks like I’m alone on this ?
He was very close to finishing, I hope he didn’t give up ?

For those who where and still interested I’ll finish this post.

If your valve stem spring was tighter than a ½ turn from contact the velocity should go up.
1/2 turn after contact with value stem more for hunting,1 turn more for target shooting.

After rechecking the results with a chrono depending where your regulator ends up.

At this point you need to decide on what pellet and it’s velocity that will give or has given you the best accuracy out of your gun. JSB 18g will be set to 880 fps to as high as 920 fps from what I’ve seen on a 22 Cricket. I’d chrono wail checking the accuracy at the same time.

Depending on the HST adjustment you want to end up on. Some prefer that it to ends up with its adjustment ending up at the midpoint (HST halfway in) at 885-890fps so they can de-tune for the use of lighter pellets. If so set the regulator to about 120-125 bar at this setting JSB 18g will top off at 890 fps, at 115-120 bar it will top off at 870-880 fps.
As a ball park reference to get you close to 125 bars from the top of the black stem to the bottom of the aluminum body of the regulator it’s measurement can be anywhere from 53.4-53.7mm.
All result with the above will vary some because of the fact that all Crickets (hammer, valve stem and regulator) springs are somewhat different within each one. But it will get you very close to your goal settings. From there you can go in and do minor tweak adjustments to obtain your target pressure.

Now to set the HST:
The regulator is the most consistent when at max speed which was set in the above, max speed being that when turning the HST CW there will be a point at which no matter how much you turn CW it will not go up in velocity.

Back out HST CCW and chrono 3 shots.
Turn HST CW 1 full turn.
Shoot and chrono 3 shots.
If speed increased turn 1/4 turn till spend no longer increases, then back out 1/4 turn ccw.

At this point it should be at your intended goal setting. If not you may want to go in again and do some tweaking of the regulator setting.
The above should give you the most shot count at 880fps valve stem spring retainer at 1/2 turn after contact, regulator at 125 bar, HST set at its midpoint (halfway in) within 880-890fps using JSB 18g.

All of my above post should answer your post question,” hammer spring versus valve stem versus regulator adjustment “and your Cricket will have a balance of all 3 spring tensions and yield the most optimum chrono stats.

My Cricket 22 standards regulator is set to 125 bars using JSB 18g it does 880 fps with a 1.43 bars per shot air consumption. I’m getting as much as 7 mags = 98 shots when I fill to 270 bars, but I’m not into shot count more into consistency so I just usually fill to 210 bar to get a 4 mags = 56 shots to carry in the BP stock mag holders.

~ GKU

I see, still try the above first before re-adjusting the reg.

Note that 2 rotations on the value spring retainer is to much, 1/2-1 turn after contact.
Back out the HST and adjust it again and see.

Using the chrono see if it’s still drops off at 85 bar.

~ GKU, I’ll be back.