Has any one installed a 720 plenum kit upgrade to there FX1 and had a problem with C1 length not measuring properly . Appreciate any input first time poster!
FX C1 to long
- Thread starter gunsmith DAVID
- Start date
I wanted to exhaust all fyi on this site before i made another move. Plus the info you just gave me on how Utah Air is good at listening sounds like i have decided where my next purchase is going to be with. Revoman Its hard to purchase when you know it might have to be returned if does not work! Because i am one guy you don't want to tell me i have to eat a 200$ gun part because it was assembled already, Because we all know you have to assemble to get to that C1 issue. So i will call ahead and explain before my purchase. Because a mans word means something to me. Hell i built a business on that. Thx again for your time Rev!
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Sorry it took so long Bigragu I know guns I don't know computers I finally figured how to send pics 
#1 is before any modifications I did with permission from Huma Air support. 
#2 is my old 
#3 is after modification this is as close as could get to the 6/6.5 mm with the new, sorry could not find any pics before modifications which both new kits valve rods measured in the high side of 9mms 
#4 if you measure your valve guide it will be much larger than then my old one here, try shoving that in a frame that excepted my measurements its not going to happen trust me. unless you spread your frame to fit it. WHY
its suppose to fit its new #6 Is( mine vs new) No room for improvement there! Is it my friend.
#1 is before any modifications I did with permission from Huma Air support. #2 is my old #3 is after modification this is as close as could get to the 6/6.5 mm with the new, sorry could not find any pics before modifications which both new kits valve rods measured in the high side of 9mms #4 if you measure your valve guide it will be much larger than then my old one here, try shoving that in a frame that excepted my measurements its not going to happen trust me. unless you spread your frame to fit it. WHY its suppose to fit its new #6 Is( mine vs new) No room for improvement there! Is it my friend. Upvote 0
There are two different sizes of the valvetube end.. One for MK1 and MK2 and a larger one for MK3. You need to order the correct part. My supplier substitutes their own part number, but the part exists and is a different size.
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thx Rob your exactly right, I was aware but huma had none in stock or did any one else at the time. I just put that out there for people not aware.
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I found some C1 pics
before modifications
this one speaks for itself.
see how different the tips look before modification. Upvote 0
If Bigragu takes a gander at your pics, he should be able to guide you in the right direction.
I'm out as he has WAY more experience than I.
mike
I'm out as he has WAY more experience than I.
mike
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Thx for the FYI Mike! Don't for one minute think I didn't enjoy are conversations. With all the firearm schooling I have, and I could tell Marc over at HumaAir was very knowledgeable when he gave me the ok to start modifying with out worry on returning it for a refund if it did not solve it. The bottom line we came to was within the C! together so that's where I started my modifications. with no avail the only thing I could not modify is if you look there is a slight shoulder before the threads on the new valve rods compared to my old one. If that's it I don't know why because those are brand new kits. So that's why I just asked a question to you real PCP masters, because honest i am virgin in your PCP world. But this rifle has gave me ton of pleasure for years until one day i was sighting in and the accuracy and air pressure fell off so i figure lets upgrade instead of just learning to put seals in. Thx again Mike (good name I am David Michael) I worked all over parts of C.A in the winters here! Thx again truly
the only thing I could not modify is if you look there is a slight shoulder before the threads on the new valve rods compared to my old one. If that's it I don't know why because those are brand new kits. So that's why I just asked a question to you real PCP masters, because honest i am virgin in your PCP world. But this rifle has gave me ton of pleasure for years until one day i was sighting in and the accuracy and air pressure fell off so i figure lets upgrade instead of just learning to put seals in. Thx again Mike (good name I am David Michael) I worked all over parts of C.A in the winters here! Thx again truly Upvote 0
David!
I was simply 'turning' it over to a much more knowledgeable person. That's my story and I'm sticking to it!
The AGN knowledge base is vast and I am but a rookie compared to most here, but I do enjoy learning like you do. Almost ALL of my air gun knowledge has come from this fine community, and I am grateful for that.
I'm pretty damn certain that you will attain a great amount of knowledge and be enabled to pass it along.
mike
I was simply 'turning' it over to a much more knowledgeable person. That's my story and I'm sticking to it!
The AGN knowledge base is vast and I am but a rookie compared to most here, but I do enjoy learning like you do. Almost ALL of my air gun knowledge has come from this fine community, and I am grateful for that.
I'm pretty damn certain that you will attain a great amount of knowledge and be enabled to pass it along.
mike
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Thx Mike and if i can ever help you with the guns that make a much bigger and loader BANG!!! that's my specialty. and i am sticking to it. God Bless
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I toke apart my MK2 so many times for any kind of mods and upgrades I can do it now with closed eyes... basically that is not an MK2 anymore but somewhere M3.5 ?
My take on it.... I know that the 6.0-6.5 mm is a ballpark (only) instruction for new mechanics, the stack up tolerance is the important and must be in front of eyes.
I know that if your C1 is sticking out longer (9mm instead of 6.5mm) the Valve Adjaster knob shall be backed out longer for about same amount (Valve Spring longer for a same amount again) ... So the Valve tuning won't happen let say between 2nd and 3rd line but about 6th line.
All these assuming the Valve poppet sitting properly (cross check the Rear Power Block). But then the Valve Adjuster knob will hit the air tank... so this operation needs some improvising.
This what I would do on my gun without any extra excitements and loosing time chasing tales, but again I cannot advise you if this is your first luve with the FX Plenum and Valve....
My take on it.... I know that the 6.0-6.5 mm is a ballpark (only) instruction for new mechanics, the stack up tolerance is the important and must be in front of eyes.
I know that if your C1 is sticking out longer (9mm instead of 6.5mm) the Valve Adjaster knob shall be backed out longer for about same amount (Valve Spring longer for a same amount again) ... So the Valve tuning won't happen let say between 2nd and 3rd line but about 6th line.
All these assuming the Valve poppet sitting properly (cross check the Rear Power Block). But then the Valve Adjuster knob will hit the air tank... so this operation needs some improvising.
This what I would do on my gun without any extra excitements and loosing time chasing tales, but again I cannot advise you if this is your first luve with the FX Plenum and Valve....
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