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Old Yesterday, 09:44 AM #1
Snoman13's Avatar
Join Date: Sep 2004
Location: Toronto, Canada
 has been a member for 10 years
DM14 maintenance/troubleshooting

I recently bought a used DM14 and when it finally arrived, even though the outside was clean, I started looking at the lpr and hpr and saw some grit and grime stuck in the screws so I decided to tear them both down, clean and lube them up and replaced the reg seat in the hyper4.

First, is it normal for air to leak out the bottom of the Hyper4 reg as you make adjustments to itwhen first putting in a brand new seat? It did leak as I turned the reg out slowly and I kept dry firing in between and that would seal it up it seemed like.

Second, if I have access at home to only a chrono, is there a process I can follow to set my hpr and my lpr to proper settings? I don't have a gauge to use for testing the hpr pressure.

Thanks, Im trying to the gun working smoothly after it arrived in extra-used condition.
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Old Yesterday, 11:34 AM #2
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I haven't run into a leak like that from my HPR, but it very well could just be some of the seals breaking in.
No need for any kind of pressure tester. one of the perks of owning a DM, imo.

set your board to stock settings, most importantly, make sure you dwell is back at 18ms.
turn your LPR all the way in until you feel resistance.
turn your LPR out 3 full turns.
turn your HPR in until you feel resistance.
turn your HPR out until you are chronoing at your desired FPS.

that will get your gun running back at stock settings. From there, you can do some more advanced tuning of the LPR and dwell to get more efficiency or a smoother shot.
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Old Yesterday, 06:20 PM #3
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Dwell 21 lpr at 2 1/2 turns

Hpr is hard to tell. I do it all by feelings
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