umarex notos 50-75 fps power mod, SIMPLE

[@charlesgreen5077]

I increased the restrictor plate transfer port hole to 4.3mm using a drill press and the 18.13 pellet chronograph results increased from just over 715 FPS to 800. I will lighten the poppet spring and see if I get further benefits. Inexpensive mod if you have access to a drill press.

[@airgunningyup]

incredible results

[@skimplyblimpz]

What is your shot count now before you drop out of the regulated pressure?

[@skimplyblimpz]

Just as a slight update. After drilling mine out to .156 which is about 4mm, using 14.3gr domed crosman pellets my velocity went from about 780 with the hammer spring screw turned all the way in to about 800 with the screw turned all the way out and my shot count remained roughly the same before pressure drops off the reg. With the screw turned all the way in I believe my peak velocity with the same 14.3gr pellets was about 830 fps so that's roughly 50 fps gain peak velocity. With the screw turned all the way in however I got about 2 full mags so 14 rounds before velocity dropped off the reg so that's a significant difference but the option is there now for more power and has made the adjustment screw actually useful now. I did also notice after removing my barrel that the o rings on the outside diameter of the barrel were slightly chewed up so I could be losing a couple fps there.

[@Danielhenning86]

I have drilled mine out to 4mm plus and have a c-88 machining plenum and drop block bottle adapter and went from 790's to 850 FPS. I also have an adjustable regulator set at about 2400.

[@heathhalfhill6401]

My suggestion is if you want that much power you should buy another gun like an Avenger honestly. To each their own but this gun takes crows at 60 yards with crosman 14.3 grain pellets doing 745 FPS stock...straight down. Its fits a niche for guys that need something in the 18-20 FPE range. The more pressure you put on the valve the sooner it will wear out. Like I said...to each their own. This gun is perfect the way it came from the Snow peak factory. I have other guns for more power like the Avenger , LCS SK-19 .25 cal @ 70 FPE, FX Crown .22 @ 30 FPE, a Nova Vista Liberty .22 @ 44 FPE. All I'm saying is once you modify it the warranty is gone and so "MAY BE" the reliability, shot count, and possibly the accuracy. You do you. Stay blessed and safe y'all.

[@SFL-Trips-ns9xx]

You hit the nail right on the head, this is more of a backpacking short rifle/pest control gun although if you adjust the hammer spring alone you can definitely take out a raccoon without an issue. It's just not made for heavy hunting and trying to modify it past what it's designed for is kinda pointless in my opinion but yes, to each their own. Modding things is always fun and not just about performance/efficiency.

[@jasonnealey8325]

Thanks for the education Rob .

[@airgunner0335]

Thank you for your video I'm planning on buying for bird control

[@johnnybbgunner2136]

Very informative. I have the plenum kit on my pistol.

[@airgunningyup]

if you open the restrictor , post results here.. would be interesting

[@johnnybbgunner2136]

@@airgunningyup I will do that for sure. I bought the extra NOTOS and chopped it into a pistol. I still need to chronograph the pistol after I pick up a 9 volt battery today.

[@Brianbri-nq3cc]

Nice!👍

[@jbhk7977]

Did you open the restrictor to 4mm? I'm looking at it myself . . . but without a plenum I don't know if this will add any speed.

[@airgunningyup]

read the conversation in the pinned comment from @slicktmi 2 months ago you should gain some fps regardless. his notos is now shooting 895 fps.. adjust the reg , open the restrictor,, adjusting the reg alone should give you 30 fps

[@jbhk7977]

@@airgunningyup Thank you for your feedback. What would you recommend (number of turns on the reg?)

[@airgunningyup]

that im unsure of , half turn at a time till desired velocity is best approach ,, so turn ,test , turn@@jbhk7977

[@seansantiago7714]

Just got notos please post another video on after

[@airgunningyup]

these comments have all the info @slicktmi 4 days ago its pinned to top

[@charlesgreen5077]

How do I remove the pistol grip to be able to get at and remove the transfer port plate so I can enlarge it to 4.3mm? Thanks

[@airgunningyup]

theres screws on the bottom , 2 cap heads.

[@charlesgreen5077]

@@airgunningyup bottom of what? there is a screw in front of the trigger guard and one in the dove tail of the grip. Are these the ones that will remove the pistol grip from the air block assy? any cautions?

[@airgunningyup]

@@charlesgreen5077 YES.. no cautions as i recall , the spring on the sear was held in place .., i did it over a yr ago and no longer have the gun but it wasnt complicated.

[@travelcompass591]

Hi 🤠 Can you still sell the "Diana Chaser Safepac"? I have a Artemis/Snowpeak CP2 which is the same build and I realty like the light weight and accuracy. I have been looking to turn it into a PCP. I don't think I need as much as 3000 PSI but just more than what the CO2 delivers would be sweet. Any hep will be much appreciated. 👍

[@airgunningyup]

yes its on ebay and my website www.froggysairguns.com/product-page/diana-chaser-safepac-25cchpa-conversion

[@stevengoodman3498]

Good tip for modding. Thanks!

[@U2513]

Did you ever drill it? If so do you plan on making a video about it? Would be interested in that thanks

[@airgunningyup]

right below this comment on the pinned comment, a person drilled it and tested. 50 fps gain was the baseline before he did other mods, and is now shooting 900 fps with it,, look for the pinned comment from slicktimi.. SO the mod works extremely well and does work.

[@U2513]

@@airgunningyup good read thanks

[@CaseriaconPCPRD]

Hello, I made the modification and went from 740 FPS with factory settings to 840 FPS. If more FPS is what you are looking for, I recommend making the modification.

[@airgunningyup]

thats really good , thanks !

[@CaseriaconPCPRD]

@@airgunningyup Thanks to your video and the comments from the community, I decided to make the modification. It was very worth it.

[@whitetailhunter9421]

Ray romano

[@airgunningyup]

i moved out of Ny 10 yrs ago , I guess the accent stayed .

[@slicktmi]

So can you just drill a second hole instead of honing out that one?

[@airgunningyup]

im not sure how, they dont align in manner that you could do that.. look at it in person you will see

[@slicktmi]

​@airgunningyup i found a dremel bit to bore it out do you think it's necessary to change the spring aswell?

[@airgunningyup]

@@slicktmi if youre looking for power, yea id trim it , its soo heavy

[@slicktmi]

@@airgunningyup so i just finished i dremeled out as much as physically possible turned the reg up 1/2 turn its around 2400-2500 put the hammer at max and i got 865 fps. I have the plenum kit i just haven't installed yet cause you have to do suppressor aswell to clear the taper on the factory suppressor but we'll see what i get when i do that.

[@slicktmi]

@@airgunningyup also prior to doing the dremel it was around 815ish fps doing what you recommended increased it alot same settings