Yugo sks will NOT cycle.

Nick9130White · June 6, 2011, 11:07 PM

I went to the range and it will not cycle rounds.
At all, I cleaned the piston, no more cosmoline, everything lubricated. But not a single round out of 70 cycled.
I was shooting fiocci and wolf. What could be the problem?
And the gas shut off valve was to the right.
I tried both ways up and right and nothing.

riggins_83 · June 6, 2011, 11:17 PM

The most common issue for these... dirty chamber or bad gas valve. Get this ( http://www.cncwarrior.com/comersus/s...sp?idProduct=1 ) and try again.

I had the exact same issue years ago. Sometimes if I flipped the valve back and forth it would cycle.. once. The steel cased ammo expands so much a lot of force is needed to cycle the weapon. Gas valve was leaking, replaced it and the gun was perfect.

Nick9130White · June 8, 2011, 01:08 AM

I took the gun a part to check it out and I realized I didn't take the gas piston extension out and clean off the cosmoline.
It had a decent amount on it. Could that also be the problem?

And is there a way to test the valve without firing it?
And how do I remove the valve?

riggins_83 · June 8, 2011, 02:16 AM

I doubt that's the issue.. if anything it would probably work better lubed if worn out.

http://www.youtube.com/watch?v=-Q73H64GIWo

SDC · June 8, 2011, 06:16 AM

The versions of the Yugo SKS that were made with the ability to launch grenades have a gas cut-off to avoid beating the piston to death while launching grenades; there should be a sliding button on the gas block in an L-shaped groove, and that slider is set in-line with the barrel (on top) for grenade-launching, and to the right for semi-auto operation.

Nick9130White · June 8, 2011, 04:11 PM

So I attempted to remove the button on the gas valve and that thing will not come off for anything.
Any tips?

Nick9130White · June 8, 2011, 04:16 PM

I tried it again and I realized when I turn it to the right it wouldn't go all the way over, then I tried to take it out and it wouldn't go all the way out so I got the punch that came with the sks and tapped it and it came out. I lubricated it and pit it back in and now it goes all the way to the right.

LAlineman · June 15, 2011, 12:12 PM

Had the same problem with my Yugo, it was the gas valve ! Keep moving it back and forth a few times. And it definately has to be clean . Mine works fine now, but it sure threw me for a loop. Also make sure it stays locked in position during your shooting session . It can move a bit and mess you up again. Good shooting!

cracked butt · June 15, 2011, 05:06 PM

Tap it with a brass drift.

Bigdog57 · June 17, 2011, 06:10 PM

Mine developed the same problem - too much gas leaking by the valve body. I removed it, cleaned it well and coated it with Permatex Blue Gasket Maker, then greased the inside of the valve housing. Installed, and the gas valve turns properly, and no problem cycling. Been running perfectly for three years now!
Worked for me.

Use your Google-Fu and you should be able to locate a guy or two who make new stainless steel gas valve bodies.

June 6, 2011, 11:07 PM	#1
Nick9130White Senior Member Join Date: January 10, 2011 Location: California. Posts: 234	Yugo sks will NOT cycle. I went to the range and it will not cycle rounds. At all, I cleaned the piston, no more cosmoline, everything lubricated. But not a single round out of 70 cycled. I was shooting fiocci and wolf. What could be the problem? And the gas shut off valve was to the right. I tried both ways up and right and nothing. __________________ Counting the days til next duck season.

June 6, 2011, 11:17 PM	#2
riggins_83 Senior Member Join Date: January 19, 2009 Location: Wherever I may roam Posts: 1,506	The most common issue for these... dirty chamber or bad gas valve. Get this ( http://www.cncwarrior.com/comersus/s...sp?idProduct=1 ) and try again. I had the exact same issue years ago. Sometimes if I flipped the valve back and forth it would cycle.. once. The steel cased ammo expands so much a lot of force is needed to cycle the weapon. Gas valve was leaking, replaced it and the gun was perfect. __________________ l've heard police work is dangerous. Yes, that's why l carry a big gun. Couldn't it go off accidentally? l used to have that problem. What did you do about it? l just think about baseball. -Leslie Nielsen

June 8, 2011, 01:08 AM	#3
Nick9130White Senior Member Join Date: January 10, 2011 Location: California. Posts: 234	I took the gun a part to check it out and I realized I didn't take the gas piston extension out and clean off the cosmoline. It had a decent amount on it. Could that also be the problem? And is there a way to test the valve without firing it? And how do I remove the valve? __________________ Counting the days til next duck season.

June 8, 2011, 02:16 AM	#4
riggins_83 Senior Member Join Date: January 19, 2009 Location: Wherever I may roam Posts: 1,506	I doubt that's the issue.. if anything it would probably work better lubed if worn out. http://www.youtube.com/watch?v=-Q73H64GIWo __________________ l've heard police work is dangerous. Yes, that's why l carry a big gun. Couldn't it go off accidentally? l used to have that problem. What did you do about it? l just think about baseball. -Leslie Nielsen

June 8, 2011, 06:16 AM	#5
SDC Senior Member Join Date: January 23, 2001 Location: People's Republic of Kanada Posts: 1,652	The versions of the Yugo SKS that were made with the ability to launch grenades have a gas cut-off to avoid beating the piston to death while launching grenades; there should be a sliding button on the gas block in an L-shaped groove, and that slider is set in-line with the barrel (on top) for grenade-launching, and to the right for semi-auto operation. __________________ Gun control in Canada: making the streets safer for rapists, muggers, and other violent criminals since 1936.

June 8, 2011, 04:11 PM	#6
Nick9130White Senior Member Join Date: January 10, 2011 Location: California. Posts: 234	So I attempted to remove the button on the gas valve and that thing will not come off for anything. Any tips? __________________ Counting the days til next duck season.

June 8, 2011, 04:16 PM	#7
Nick9130White Senior Member Join Date: January 10, 2011 Location: California. Posts: 234	I tried it again and I realized when I turn it to the right it wouldn't go all the way over, then I tried to take it out and it wouldn't go all the way out so I got the punch that came with the sks and tapped it and it came out. I lubricated it and pit it back in and now it goes all the way to the right. __________________ Counting the days til next duck season.

June 15, 2011, 12:12 PM	#8
LAlineman Member Join Date: October 28, 2009 Location: Los Angeles, Ca. Posts: 82	Had the same problem with my Yugo, it was the gas valve ! Keep moving it back and forth a few times. And it definately has to be clean . Mine works fine now, but it sure threw me for a loop. Also make sure it stays locked in position during your shooting session . It can move a bit and mess you up again. Good shooting!

June 15, 2011, 05:06 PM	#9
cracked butt Senior Member Join Date: December 22, 2001 Location: southeastern wisconsin Posts: 537	Tap it with a brass drift.

June 17, 2011, 06:10 PM	#10
Bigdog57 Senior Member Join Date: December 2, 2006 Posts: 122	Mine developed the same problem - too much gas leaking by the valve body. I removed it, cleaned it well and coated it with Permatex Blue Gasket Maker, then greased the inside of the valve housing. Installed, and the gas valve turns properly, and no problem cycling. Been running perfectly for three years now! Worked for me. Use your Google-Fu and you should be able to locate a guy or two who make new stainless steel gas valve bodies.