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CR600w Mods |
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Pauly5 
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Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1548 |
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 Topic: CR600w ModsPosted: 12 Jan 2025 at 9:34am |
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It would have been autosol. I think I used a wooden dowel that I shaped to match and used that with autosol.
I'll try and look up photos of the valve from when I did it. |
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Loud_Whisper
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Joined: 29 Sep 2024 Location: Auckland Status: Offline Posts: 13 |
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Posted: 12 Jan 2025 at 5:28am |
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Yep I've opened it up maybe 3 or 4x now. Last night I lapped it with sensodyne toothpaste while assembled and using the spring's tension. No change.
At the same time I did remove those washers and shim the hammer spring differently, so it's now getting 13-15fpe. It just can't be left for more than an hour or 3, which makes casual bird shooting hard. What did you polish yours with? |
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Pauly5
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Joined: 11 Mar 2013 Location: Titahi Bay Status: Offline Posts: 1548 |
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Posted: 12 Jan 2025 at 4:42am |
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Good work. Have you opened up the poppet valve yet? I had one of these guns I'd bought as faulty and swarf had scratched the valve faces. It polished out, or I made a new one, can't remember, but it was an easy fix.
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kruzaroad
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Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2473 |
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Posted: 12 Jan 2025 at 3:54am |
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From my basic understanding, and ive not looked to deep into co2.
Its got a limit of pressure. Heat effects it. The push of co2 gives a higher fpe with larger cal. But i am assuming you need to increase volume for this.would also assume that being the case a heavier pellet of same cal increases fpe The bigger the bottle the more consistent the shot. The faster you shoot the more it cools itself and drops pressure. A longer barrel helps. As say i dont really know squat about co2 and thats just stuff that seems to be in the grey matter. Also rember a video where a guy sujested using special cylinders that had some sort of additive that helped to maintain the seals and lubricate the valves every half dozen cylinders. Walther made them I think. Though my tube of pellgun oil states its for co2 as well and does the same thing. You seem pretty onto it on the tinkering side. 👍 |
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Loud_Whisper
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Joined: 29 Sep 2024 Location: Auckland Status: Offline Posts: 13 |
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Posted: 11 Jan 2025 at 2:10pm |
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Yeah, I bought this used at around 5 years old I believe, so there has been a fair bit of wear and tear on it. I hadn't done any mods on the gun at the time I fixed the magazine slop above, but have since:
1) Bored all transfer ports to 4.5mm and sanded with P400(wet, and may re-do this) 2) Drilled valve cavity to slightly increase shot volume. Around 3-5mm deeper (did not widen) and added washers to valve spring to keep valve preload the same as it was. This is to try and avoid worsening the already leaking poppet valve. (washers to be removed once leak is remedied and hopefully uncork it further) 3) Mirror finished hammer and hammer tube, polished starting with wet and dry, starting at P400 and ending at P1000. Applied a 'very' small amount of graphite lube here. 4) Added 4x washers to increase hammer spring preload (approx 4mm) 5) Re-packed silencer using the 2x plastic spacers from my Hatsan 135QE + some woollen (?) blanket between spacer & can. Kept 2 of the factory "washers" in place. 6) Removed trigger and pinched trigger housing together a few fractions of a mm. No shims needed! Lazy but free and gave an 80% improvement with 2 minutes of trial and error. Chrono readings from my android app are low and inconsistent versus what I'd hope for after these mods (9-12fpe, hoped for 15-18 based on Minty's experience) Waiting for arrival real chrono arriving next week from ali before I really dig into this but keen to hear anyone's thoughts. Next mods: #Bulk fill of some type. #Re-finish stock including a Co2 removal tool to stow in/under butt plate Edited by Loud_Whisper - 11 Jan 2025 at 2:12pm |
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kruzaroad
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Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2473 |
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Posted: 04 Jan 2025 at 9:12am |
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Nice fix Elliott. Good bit of kiwi ingenuity.
Ill file that away in the old grey matter as a useful concept incase i ever need it. Hey bill bob do you want a neoprene sleeve for that co2 bottle on your cr? I brought a pair to make a cheek riser for the 1322. Only need one. Be a stable insulator compared to bare metal. |
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Billbobnz
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Joined: 14 Jun 2020 Location: Ashburton Status: Offline Posts: 882 |
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Posted: 03 Jan 2025 at 5:27pm |
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Hello, that is interesting you had that issue. Mine is and has been perfect since I got it. The mag fits snug and has no movement.
Have you done another mods? We mis Dvlnme you may have heard that he passed away. |
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Loud_Whisper
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Joined: 29 Sep 2024 Location: Auckland Status: Offline Posts: 13 |
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Posted: 03 Jan 2025 at 4:40pm |
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Hey mate, not sure if you got this sorted or if this may help someone else, but;
I just got one of these and have had the same thing. I removed the barrel and was able to replicate the fault and found pellets were coming out badly scarred from the magazine itself. I found the magazine doesn't sit perfectly aligned with the barrel, and pushing the bolt forward makes this worse. I did two things to help improve this: 1, Disassemble magazine and slightly chamfer the inner edge of the hole the pellet exits through (80% of the improvement came from this) I used a small dremel tool with a cone shaped grinding wheel, but there are many ways to skin this cat. 2, Note that the magazine itself moves quite far when the bolt comes forward, especially with a badly snagged pellet. On the front face of the magazine there's an empty thread down the bottom right corner (looking at magazine from shooter's POV) I put a screw in this and cut the head off just above the surface. This holds the mag in place and stops it wobbling around and exasperating snagged pellets. This was the remaining 20% of the imrpovement. The gun now cycles exactly as it should. I should say I also used a small wooden dowel with P400 (wet) to deburr around the transfer port and inner barrel, recommended if yours aren't smooth already. |
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Elliot87
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Joined: 20 Feb 2023 Location: Christchurch Status: Offline Posts: 100 |
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Posted: 18 Mar 2023 at 12:23pm |
I had seen that he hadn't been active on here for a few months and before I joined, so I didn't want to message him out of the blue about it.
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Pom that wants to be a kiwi
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Pauly5
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Posted: 18 Mar 2023 at 6:51am |
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I'm sure we will hear from Dvlnme soon. He has had an eye injury and been unable to look at screens for a while.
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Pauly5 wrote: