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Low FPS: Cyma 035, Possible AirLeak
| bunker buster |
Posted: November 30, 2008 11:11 pm
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Group: Members Posts: 14 Joined: November 01, 2008  |
Hello Komrade!
I got another Cyma 035, Stock velocity is in 390-400FPS. So I upgraded the spring w/PDI 190%, metal spring guide w/bearing and JG red piston body w/metal teeth. FPS went down to 290FPS! So I return the stock setup, orig cyma piston body n sring velocity is only 260FPS! What happened kaya? The stock piston (white) when I check the compression my singaw.With the JG it has less or no singaw. Kaya I was expecting the velocity to be in the 430FPS. Help mga komrade! I was excited after the upgrade to find out I can't even punch a hole on the bottom part of the coke can  |
 
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| alakdan.net [aka 9th] |
Posted: December 01, 2008 12:07 am
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 Group: Moderator Posts: 2837 Joined: May 06, 2007 |
Air leak yan komrad...
"The eM-poR is a cheap prostitute. She needs to be dressed with flashy accessories to be attractive. The kalashnikov is beautiful in herself. She does not need stilettos and lipstick. You may want to have a one night stand with a Stoner Rifle, but you marry the Kalashnikov.™" |
 
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| bunker buster |
Posted: December 01, 2008 08:17 am
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Group: Members Posts: 14 Joined: November 01, 2008 |
kasi po komrade what I don't understand nung stock pa cya (not yet disassembled) FPS nasa 390-400. Just the mere fact of opening the gearbox na kaka air leak na po?
Di ko naman ginalaw yng air seal nozzle, hop up chamber or barrel. Just a simple swap of parts (spring guide,spring and piston body) Like what I did with my A&K M249 I just change the piston body from stock to JG tumaas yng FPS from 390 to 420FPS. |
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| alakdan.net [aka 9th] |
Posted: December 01, 2008 11:40 am
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Group: Moderator Posts: 2837 Joined: May 06, 2007 |
Can you check this part (with arrow) if totally engage (zero gap).
 This is usually my probs with the two Cyma AKSU (includes my new AK105) i got, putting a hard plastic at back of gearbox is my solution.
"The eM-poR is a cheap prostitute. She needs to be dressed with flashy accessories to be attractive. The kalashnikov is beautiful in herself. She does not need stilettos and lipstick. You may want to have a one night stand with a Stoner Rifle, but you marry the Kalashnikov.™" |
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| moky |
Posted: December 01, 2008 12:16 pm
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 Group: Global Moderator Posts: 234 Joined: August 01, 2008 |
That's true! You need to check the gap between your GB and hop up chamber.
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| bunker buster |
Posted: December 01, 2008 07:49 pm
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Group: Members Posts: 14 Joined: November 01, 2008 |
komrad Alakdan and Moky,
Please check out photo of my CM035  Mukhang no gap naman po |
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| alakdan.net [aka 9th] |
Posted: December 01, 2008 08:42 pm
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Group: Moderator Posts: 2837 Joined: May 06, 2007 |
Ok...
Now you have to check the ff: 1.) Piston Head O-ring 2.) The Cylinder Head for possible source of airleak, put teflon on it. 3.) Check the Cylinder Head Nozzle. 4.) Put also teflon on hop rubber. Common for ACM stock with full of grease that help prevent airleak, when we clean the excess grease, the gun loose a compression.
"The eM-poR is a cheap prostitute. She needs to be dressed with flashy accessories to be attractive. The kalashnikov is beautiful in herself. She does not need stilettos and lipstick. You may want to have a one night stand with a Stoner Rifle, but you marry the Kalashnikov.™" |
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| moky |
Posted: December 02, 2008 03:52 am
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Group: Global Moderator Posts: 234 Joined: August 01, 2008 |
Dami no? kakahilo! LOL!
I'd check the hop rubber first. Teflon seal it. Then if symptoms persist consult your doctor (alakdan). 
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| alakdan.net [aka 9th] |
Posted: December 02, 2008 04:01 am
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Group: Moderator Posts: 2837 Joined: May 06, 2007 |
OT:
speaking of doctor, my wife is a Physician. Her colleague don't know that i am not but call me also "dok"...well i am an MD, meaning "Murag Doctor". (Murag means "Like") Korni no?  BTT: Yup...check first the hop like what komrad master moky says...  But i doubt ang airleak nasa Cylinder head yan... 
"The eM-poR is a cheap prostitute. She needs to be dressed with flashy accessories to be attractive. The kalashnikov is beautiful in herself. She does not need stilettos and lipstick. You may want to have a one night stand with a Stoner Rifle, but you marry the Kalashnikov.™" |
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| bunker buster |
Posted: December 02, 2008 09:49 am
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Group: Members Posts: 14 Joined: November 01, 2008 |
Cge komrade.
That's a plausible explaination why it was malakas if left untouch. |
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| bunker buster |
Posted: December 06, 2008 10:08 pm
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Group: Members Posts: 14 Joined: November 01, 2008 |
Ay naku mga Komrade, as it turns out sira pala yng hop up ko.The front part of the hop where it hold d barrel to the hop unit was detached.kaya pala super singaw.I interchange my other AK74U front and was able to isolate the problem.
Spend another P800 for a king arms hop assembly FPS now is 440 w/PDI 190% Anyway thanks for the feedback and suggestion po mga komrads!  |
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| alakdan.net [aka 9th] |
Posted: December 06, 2008 11:55 pm
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Group: Moderator Posts: 2837 Joined: May 06, 2007 |
Good to know...
"The eM-poR is a cheap prostitute. She needs to be dressed with flashy accessories to be attractive. The kalashnikov is beautiful in herself. She does not need stilettos and lipstick. You may want to have a one night stand with a Stoner Rifle, but you marry the Kalashnikov.™" |
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| moky |
Posted: December 07, 2008 04:10 pm
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Group: Global Moderator Posts: 234 Joined: August 01, 2008 |
ok!
Tira Tira!!!
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