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#648795 - 04/15/16 8:01 pm Try the XS650 PCV valve on a Brit twin  
Joined: Feb 2015
Posts: 258
Steven A Offline
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Steven A  Offline
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Joined: Feb 2015
Posts: 258
Melbourne Oz
Hi All,

Has any body experimented with one of these on a big twin?

https://www.mikesxs.net/parts/yamaha-xs650-reed-type-engine-breather-valve-pcv

Yam seem to think it worth while.

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#648817 - 04/16/16 1:56 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Dec 2004
Posts: 8,896
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,896
Scotland
Very common on Commandos, works very well as the reed valve stays responsive at higher revs which is the problem with non return valves with ball bearings etc. To get one cheaper and in different configuration put EGR valve into eBay, used on modern small bike engines for emission improvement. I go for the 180 degree ones as its easier to fit.

Last edited by kommando; 04/17/16 10:59 am. Reason: EGR not ERG
#648873 - 04/16/16 11:36 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: May 2005
Posts: 3,754
shel Online content
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shel  Online Content
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Joined: May 2005
Posts: 3,754
ohio
I have one on my Bonnie, I believe it works well. I had a small leak on the primary side that I've never been able to cure. It only leaks when the engine is hot. I've come to believe it is a very fine crack or porosity. Installing the crank valve seems to have cured it.


When given the choice between two evils I picked the one I haven't tried before
#648932 - 04/17/16 12:25 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Oct 2008
Posts: 4,861
DavidP Offline
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DavidP  Offline

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Posts: 4,861
Gnashville
I have one on my A65. The breathing is modified to work like a later Triumph twin. I mounted the valve in the front of the air box (OIF.) It works well.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
#648955 - 04/17/16 5:56 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Jan 2005
Posts: 921
Don Leaming Online content
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Don Leaming  Online Content
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Joined: Jan 2005
Posts: 921
Ontario Canada
About the best mod you can make on a Series 2 RE Interceptor. It never really leaked after the rebuild but with the reed valve breather I didn't even get that oily mist around the sump plug.
It would work just as well on a Series 1A since it has that big crank case breather hose too.
Cheers
Don


1965 Royal Enfield Interceptor
1969 Triumph Tiger 650
#648958 - 04/17/16 6:37 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Sep 2005
Posts: 5,963
Ger B Offline
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Ger B  Offline
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Posts: 5,963
NL
Quote:
I mounted the valve in the front of the air box (OIF.)

DavidP, where does the air delivery from the engine to your reed valve come from?


Ger B

#648982 - 04/17/16 12:38 pm Re: Try the XS650 PCV valve on a Brit twin [Re: Ger B]  
Joined: Oct 2008
Posts: 4,861
DavidP Offline
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DavidP  Offline

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Joined: Oct 2008
Posts: 4,861
Gnashville
Originally Posted By Ger B
Quote:
I mounted the valve in the front of the air box (OIF.)

DavidP, where does the air delivery from the engine to your reed valve come from?

From the front of the primary case.

Most of these which I've seen exit from the top of the case, but this is where PO put it.
Works a lot better since I removed the crank seal. grin


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
#648983 - 04/17/16 12:40 pm Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Sep 2005
Posts: 5,963
Ger B Offline
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Ger B  Offline
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Joined: Sep 2005
Posts: 5,963
NL
Thank you David.


Ger B

#649146 - 04/18/16 10:54 pm Re: Try the XS650 PCV valve on a Brit twin [Re: kommando]  
Joined: Feb 2015
Posts: 258
Steven A Offline
BritBike Forum member
Steven A  Offline
BritBike Forum member

Joined: Feb 2015
Posts: 258
Melbourne Oz
Originally Posted By kommando
Very common on Commandos, works very well as the reed valve stays responsive at higher revs which is the problem with non return valves with ball bearings etc. To get one cheaper and in different configuration put EGR valve into ebay, used on modern small bike engines for emission improvement. I go for the 180 degree ones as its easier to fit.


I've had a look on eBay but can only find the actual reeds, not the whole valve. Have you a particular bike and model to recommend.

#649152 - 04/18/16 11:27 pm Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Dec 2004
Posts: 8,896
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,896
Scotland
Have 2 of these 180 degree ones

http://www.eBay.co.uk/itm/YAMAHA-YZF-R-125-R125-2008-2014-EGR-EXHAUST-AIR-VALVE-/171540935709?hash=item27f0a2f41dgFZUAAOSwuMFUZH8T

#649727 - 04/22/16 9:34 am Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Oct 2003
Posts: 11,110
RF Whatley Online content
BritBike Forum member
RF Whatley  Online Content
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Joined: Oct 2003
Posts: 11,110
North Georgia, USA
The reeds work much, much better than the older spring loaded plunger type. Several cars use the same reed design in their PCV valves, which can be had in black plastic at Walmart in the $5 range.


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
#649748 - 04/22/16 12:06 pm Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A]  
Joined: Jul 2005
Posts: 603
6T Offline
BritBike Forum member
6T  Offline
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Joined: Jul 2005
Posts: 603
back down the 'smoke',England
..bought a couple of these on fleabay for under 6 each but haven't tried them yet.Cheers!(item 162027503800)


Last edited by 6T; 04/22/16 12:08 pm.

...I do not and cannot accept the principal that incompetence justifies dismissal...
BMW R1100rt
6T 1965
T110 1958
#649880 - 04/23/16 12:36 pm Re: Try the XS650 PCV valve on a Brit twin [Re: 6T]  
Joined: Jan 2012
Posts: 421
Pete Suchawreck Offline
BritBike Forum member
Pete Suchawreck  Offline
BritBike Forum member

Joined: Jan 2012
Posts: 421
Western NY
Added one to my T140-seems to work but it was a mod from the start when i rebuilt the motor. Clutch cover doesn't leak with a thick gasket. Heads are decent but mist a little.


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