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CG125 cylinder heads

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DrewBlood23
L Plate Warrior



Joined: 28 Sep 2019
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PostPosted: 19:57 - 28 Sep 2019    Post subject: CG125 cylinder heads Reply with quote
Hallo everybody,
I have a cg125 es4 with the stupid PAIR valve, this piece of genius design (please ladle on gallons of sarcasm) has resulted in both valve seat and valve to be burnt black as night. Valves are a ridiculous price for these engines and they'll just end up the same as the current one.
My question.....
Can you replace the es4 head with an earlier model, one without the crappy PAIR valve?
Cheers
Drew
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 22:59 - 28 Sep 2019    Post subject: Reply with quote
Does it work like this?

https://www.youtube.com/watch?v=_xMykbzJWiQ
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WD Forte
World Chat Champion



Joined: 17 Jun 2010
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PostPosted: 23:58 - 28 Sep 2019    Post subject: Reply with quote
Corrupt me if I'm wrong but a PAIR or passive air injection valve allows clean air into the exhaust just after the valve to burn off hydrocarbons in order to satisfy emission standards.
One of my lads had CG clone with one and I just made a plate and blanked it off at the head and pipe.
The bike ran fine, good plug colour too.

Just blank the fecker off and check the plug colour after a wee while to see if you need to rejet/modify anything
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 00:11 - 29 Sep 2019    Post subject: Reply with quote
Many people just shove a marble/ball bearing up the PAIR intake pipe so it can't breathe.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 00:11 - 29 Sep 2019    Post subject: Re: CG125 cylinder heads Reply with quote
DrewBlood23 wrote:
the stupid PAIR valve ... has resulted in both valve seat and valve to be burnt black as night. Valves are a ridiculous price for these engines and they'll just end up the same as the current one.

Sounds as though it's running a bit rich. Why do you think it's the PAIR valve's fault? Are the valves actually damaged?
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DrewBlood23
L Plate Warrior



Joined: 28 Sep 2019
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PostPosted: 11:36 - 29 Sep 2019    Post subject: Reply with quote
The valve is shagged the valve seat needs recutting, yes I can blank it off BUT
Can I use an earlier head instead of repairing current one?
That's all I need to know.
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Mr Hammers
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Joined: 10 Jul 2008
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PostPosted: 11:50 - 29 Sep 2019    Post subject: Reply with quote
Riejufixing wrote:
https://www.youtube.com/watch?v=_xMykbzJWiQ

Isn't this the same numpty that grinds off half his brake pads to 'decrease rolling friction'?
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Riejufixing
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Joined: 24 Jun 2018
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PostPosted: 12:04 - 29 Sep 2019    Post subject: Reply with quote
Mr Hammers wrote:
Riejufixing wrote:
https://www.youtube.com/watch?v=_xMykbzJWiQ

Isn't this the same numpty that grinds off half his brake pads to 'decrease rolling friction'?

No idea, never seen him before that I know.

Hm. Which half? Wink
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Mr Hammers
World Chat Champion



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PostPosted: 12:21 - 29 Sep 2019    Post subject: Reply with quote
Riejufixing wrote:
No idea, never seen him before that I know.

Hm. Which half? Wink

Bottom Smile Yep, it is the same guy.

https://youtu.be/mdROhLTKK-A?t=1879

Rolling Eyes
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Pete.
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Joined: 22 Aug 2006
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PostPosted: 13:11 - 29 Sep 2019    Post subject: Reply with quote
His tee-shirt says it all really.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 13:59 - 29 Sep 2019    Post subject: Reply with quote
DrewBlood23 wrote:
The valve is shagged the valve seat needs recutting, yes I can blank it off BUT
Can I use an earlier head instead of repairing current one?
That's all I need to know.


I'd suggest what you actually need to know is why your valve and seat are burned because it's not because of the PAIR valve.

Until you work that out, any new head could go the same way.

Holy shit, CG125 exhaust valves are expensive! I can get plasma nitride race valves for my enfield for less than that.
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ThatDippyTwat
World Chat Champion



Joined: 07 Aug 2016
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PostPosted: 16:17 - 29 Sep 2019    Post subject: Reply with quote
Mr Hammers wrote:
Riejufixing wrote:
https://www.youtube.com/watch?v=_xMykbzJWiQ

Isn't this the same numpty that grinds off half his brake pads to 'decrease rolling friction'?


He's a first class fuckwit without a clue. It was funny when he binned it on a 125 though.
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DrewBlood23
L Plate Warrior



Joined: 28 Sep 2019
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PostPosted: 20:38 - 29 Sep 2019    Post subject: Reply with quote
stinkwheel wrote:
DrewBlood23 wrote:
The valve is shagged the valve seat needs recutting, yes I can blank it off BUT
Can I use an earlier head instead of repairing current one?
That's all I need to know.


I'd suggest what you actually need to know is why your valve and seat are burned because it's not because of the PAIR valve.

Until you work that out, any new head could go the same way.

Holy shit, CG125 exhaust valves are expensive! I can get plasma nitride race valves for my enfield for less than that.


There's a lot of reports of exhaust valve burning due to PAIR valves.
Can someone just answer my question.
CAN I FIT AN EARLY MODEL HEAD TO AN ES7 BARREL? YES OR NO?
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 20:51 - 29 Sep 2019    Post subject: Reply with quote
DrewBlood23 wrote:


There's a lot of reports of exhaust valve burning due to PAIR valves.
Can someone just answer my question.
CAN I FIT AN EARLY MODEL HEAD TO AN ES7 BARREL? YES OR NO?


Eh? Speak up. Some of us are knocking on a bit and our hearing isn't what it used to be.
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Riejufixing
World Chat Champion



Joined: 24 Jun 2018
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PostPosted: 22:22 - 29 Sep 2019    Post subject: Reply with quote
Nobby the Bastard wrote:
Eh? Speak up. Some of us are knocking on a bit and our hearing isn't what it used to be.

What?
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 08:38 - 30 Sep 2019    Post subject: Reply with quote
If you can find the parts lists, see if the head gasket is the same part number. If it is, there is a very good chance it'll fit.
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Polarbear
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Joined: 24 Feb 2007
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PostPosted: 11:23 - 30 Sep 2019    Post subject: Reply with quote
DrewBlood23 wrote:

There's a lot of reports of exhaust valve burning due to PAIR valves.
Can someone just answer my question.
CAN I FIT AN EARLY MODEL HEAD TO AN ES7 BARREL? YES OR NO?


I don't know. You are probably better asking on a specialist forum if there is some such animal.

Oh. you could ask Tef. He might not know but he'll still give you an answer. Whistle
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