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And, in addition to enlarging your transfer port, you'll want to enlarge (drill out) the valve opening as well...

Shooting 8.4's at about 780fps. Huma set at about 95 bar. Stroke at about 8.5, stock hammer. Spring maxed out at 7 turns. That belleville configuration was as received from Huma (Marauder Pistol and 1720t are the same regulator)

Here's the configuration that I'm using ( ) ( ( ) ) ( )

The leak has been fixed. I received a replacemant valve seat and valve pin under warranty from UA. Replaced both and no more leak. I was unable to remove the old valve seat with unmodified hemostats. So, I modified a pair like in this picture, to make removal easier. Even so I struggled for...

Thanks for the offer, appreciated. To get the valve seat out you can use hemostats. To reinstall the valve seat a special tool helps. Here's a couple of videos that show both removal and installation: (removal 7:50, reinstallation 45:45) I've seen the FX Valve installation tool at...

Update - THE LEAK HAS BEEN FOUND!!! This is not a test. THE LEAK HAS BEEN FOUND!!! LOL. I contacted Utah Air. Said I wanted to try and fix the leak on my own and explaned all the places I checked. They suggested checking the back of the gauges with the leak detector as well as removing the...

Recently I didn't shoot the gun for 2 weeks and it lost almost 30 Bar. I'd check on it every day or two and watched the needle slowely but surely go down down down. This is with a 580cc bottle, so a smaller bottle would be even more. I can try not to worry about it and keep shooting, but it's...

Thanks for the good info. I removed the bottle and did the dunk test - no bubbles. FWIW after I've put leak detector solution in the reg vent hole, I've then rolled a small piece of toilet paper between my fingers into a sharp tip, inserted into hole and soaked the fluid back out, same with...

Yes, I've checked the fill QD many times with drops of leak detector. I think in my writeup I called it the "fill nipple exit" lol

Thanks, I've put drops of leak detector in that hole by the top yellow arrow every time I"ve removed the stock to once again try and find the leak.

Yes, using the balloon to check for a valve leak. I seem to have eliminated leaks that are externally findable with leak detector solution. If the valve can leak without inflating my balloon, then the leak might be getting narrowed down to the valve. Maybe replace the valve stem and valve...

Thanks for the arrows and your help/assistance. I'm confident that the gun is not leaking where you have the arrows as I have tried many rounds of leak detector on those spots.

Yes, several times.

I've found leaks before with the leak detector. It usually bubbles up obviously, probably better than soap and water.

I do have a current Crown MK II (less than a year old) with I believe the latest AMP regulator. Yes, I should get bubbles somewhere if it were leaking, right?

My FX Crown has a slow leak, about 2 bar/day - over 10 bar per week. I have leak detector fluid and have removed the stock at least 4 times looking for the leak over and over without success. I've checked the base of each gauge, the foster fill nipple base, fill nipple exit, all around the...

The hammer might be binding in the tube. I had the same issue with a crosman 1701P. Here's a video I found that discusses the issue: I have two 1720t's and a 1701P. Polishing the tube made all 3 much easier to cock and smoother. Good luck.

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