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Try the XS650 PCV valve on a Brit twin #648795
04/15/16 8:01 pm
04/15/16 8:01 pm
Joined: Feb 2015
Posts: 275
Melbourne Oz
S
Steven A Offline OP
BritBike Forum member
Steven A  Offline OP
BritBike Forum member
S
Joined: Feb 2015
Posts: 275
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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Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648817
04/16/16 1:56 am
04/16/16 1:56 am
Joined: Dec 2004
Posts: 9,332
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,332
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
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648873
04/16/16 11:36 am
04/16/16 11:36 am
Joined: May 2005
Posts: 3,814
ohio
shel Offline
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shel  Offline
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Joined: May 2005
Posts: 3,814
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
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648932
04/17/16 12:25 am
04/17/16 12:25 am
Joined: Oct 2008
Posts: 5,000
Gnashville
DavidP Offline

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DavidP  Offline

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Joined: Oct 2008
Posts: 5,000
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"
72 T120V cafe project "Mr. Jim"
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648955
04/17/16 5:56 am
04/17/16 5:56 am
Joined: Jan 2005
Posts: 962
Ontario Canada
Don Leaming Offline
BritBike Forum member
Don Leaming  Offline
BritBike Forum member
Joined: Jan 2005
Posts: 962
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
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648958
04/17/16 6:37 am
04/17/16 6:37 am
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline
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Ger B  Offline
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G
Joined: Sep 2005
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

Re: Try the XS650 PCV valve on a Brit twin [Re: Ger B] #648982
04/17/16 12:38 pm
04/17/16 12:38 pm
Joined: Oct 2008
Posts: 5,000
Gnashville
DavidP Offline

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DavidP  Offline

BritBike Forum member
Joined: Oct 2008
Posts: 5,000
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"
72 T120V cafe project "Mr. Jim"
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #648983
04/17/16 12:40 pm
04/17/16 12:40 pm
Joined: Sep 2005
Posts: 5,963
NL
G
Ger B Offline
BritBike Forum member
Ger B  Offline
BritBike Forum member
G
Joined: Sep 2005
Posts: 5,963
NL
Thank you David.


Ger B

Re: Try the XS650 PCV valve on a Brit twin [Re: kommando] #649146
04/18/16 10:54 pm
04/18/16 10:54 pm
Joined: Feb 2015
Posts: 275
Melbourne Oz
S
Steven A Offline OP
BritBike Forum member
Steven A  Offline OP
BritBike Forum member
S
Joined: Feb 2015
Posts: 275
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.

Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #649152
04/18/16 11:27 pm
04/18/16 11:27 pm
Joined: Dec 2004
Posts: 9,332
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,332
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

Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #649727
04/22/16 9:34 am
04/22/16 9:34 am
Joined: Oct 2003
Posts: 11,200
North Georgia, USA
RF Whatley Offline
BritBike Forum member
RF Whatley  Offline
BritBike Forum member
Joined: Oct 2003
Posts: 11,200
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
Re: Try the XS650 PCV valve on a Brit twin [Re: Steven A] #649748
04/22/16 12:06 pm
04/22/16 12:06 pm
Joined: Jul 2005
Posts: 604
back down the 'smoke',England
6T Offline
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6T  Offline
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Joined: Jul 2005
Posts: 604
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
Re: Try the XS650 PCV valve on a Brit twin [Re: 6T] #649880
04/23/16 12:36 pm
04/23/16 12:36 pm
Joined: Jan 2012
Posts: 421
Western NY
P
Pete Suchawreck Offline
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Pete Suchawreck  Offline
BritBike Forum member
P
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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