Pair Valve

doats · 10-01-2008, 08:53 PM

Does '08 Nomad have pair valve (CA model)? If so can/should it be disconnected and how?

Thanks

Ken

macmac · 10-01-2008, 08:56 PM

I live in NH USA, and never heard this term. Is there any other name? I haven't seen it in the book either.

gopjohnny · 10-01-2008, 08:59 PM

my suzuki intruder had it, but I have not seen anyone mention it for the nomad, You might check fixits website

lomax · 10-01-2008, 11:26 PM

...I was curious about this so I found this bit of info about it. It appears like it performs a similar function to the reed valves on our bikes....

The Pair Valve is a pollution control "Pulsed Air Injection" device, designed to "wash out" the purposely rich exhaust of the new metric bikes in order to pass EPA restrictions for import in the United States and other countries with similar restrictions. Many foreign designated models do not even come with a pair valve, although all other aspects of the bike's engine are the same. (The triangular (or oval) box is a tool box on most foreign models)

The sole purpose for the Pair Valve is to passively "Inject" fresh air into the exhaust system at the exhaust port, to cause ignition of unburned fuel vapor *before* it leaves the exhaust pipes, or to thin out the mixture with enough air to fool the sniffer machines. Unburned fuel vapors enter the exhaust system whenever you back off the throttle, or gear down. When you close the throttle, as in gearing down or slowing down, the drop in vacuum at the intake port allows the Pair Valve to relax and open and allow air from the air filter box to be "siphoned" into the exhaust port by the negative pressure at the exhaust ports. (there are reed valves in the pair valve to prevent backflow from the exhaust to enter the pair valve and airbox during roll-on and subsequent positive exhaust port pressure).

**ringadingh** · 10-01-2008, 11:32 PM

I learned something new today. Never heard of it before.

cactusjack · 10-01-2008, 11:50 PM

My 2005 C50T had a pair valve. It mounted in the area where our left side air filter assembly is. I know that de-PAIRing a Suzuki is a popular mod.

macmac · 10-02-2008, 09:06 AM

Me too, as i said I never heard the term. lomax has a grip on it, and we do yank reed valves often. gadjets site has all the info on how to do so and why.
http://www.gadgetjq.com/gadgetsfixitpage.htm

dogdoc · 10-02-2008, 01:16 PM

I never heard of a pair valve but I do have 2 pear trees in my yard! :-)

cactusjack · 10-02-2008, 02:39 PM

Quote:

Originally Posted by Doc (Lonewolf)

I never heard of a pair valve but I do have 2 pear trees in my yard! :-)

What, and no partridge?

blowndodge · 10-02-2008, 03:05 PM

Isn't that the same thing as the hose that leads from the backing plate on the injectors to the exhaust that we marble sometimes??

doats · 10-02-2008, 07:51 PM

Quote:

Originally Posted by cactusjack

My 2005 C50T had a pair valve. It mounted in the area where our left side air filter assembly is. I know that de-PAIRing a Suzuki is a popular mod.

Yes. I had C90T and needed to plug pair valve in order to eliminate popping from after market exhaust.

Another question: What's the stuff under the right-side round cover -- I thought was pair valve?

skimo · 10-02-2008, 09:08 PM

http://www.gadgetjq.com/rv_removal.htm

http://www.gadgetjq.com/smogstuffremove.htm

macmac · 10-03-2008, 09:13 AM

Yes BD, it is similar in function.. I have never seen it with my eyes, but from what I read it is the same idea. On a car which I know you will know we called it EGR, only this adds fresh air to the exhaust, instead of recirculate exhaust into the intake. Bassakwards but more or less the same function.

These days every one has a different word for everything.. The only pair of anything that counts to me is either in a holster, or on my wife's chest. Come to think of it, she has those holstered too.

10-01-2008, 08:53 PM	#1
doats Jr. Member Join Date: Oct 2008 Posts: 3	Pair Valve Does '08 Nomad have pair valve (CA model)? If so can/should it be disconnected and how? Thanks Ken Login or Register to Remove Ads
	0

10-01-2008, 08:56 PM	#2
macmac Sr. Contributor Join Date: Apr 2008 Location: Tamworth New Hampster 06 1600 Posts: 12,484	Pair Valve I live in NH USA, and never heard this term. Is there any other name? I haven't seen it in the book either. __________________ 06 1600 Nomad Just call me Mac molon labe come and get it
	0

10-01-2008, 08:59 PM	#3
gopjohnny Member Join Date: Feb 2008 Location: Moulton Alabama Posts: 304	Pair Valve my suzuki intruder had it, but I have not seen anyone mention it for the nomad, You might check fixits website
	0

10-01-2008, 11:26 PM	#4
lomax Advanced Member Join Date: Jul 2007 Location: Morinville, AB Posts: 904	Pair Valve ...I was curious about this so I found this bit of info about it. It appears like it performs a similar function to the reed valves on our bikes.... The Pair Valve is a pollution control "Pulsed Air Injection" device, designed to "wash out" the purposely rich exhaust of the new metric bikes in order to pass EPA restrictions for import in the United States and other countries with similar restrictions. Many foreign designated models do not even come with a pair valve, although all other aspects of the bike's engine are the same. (The triangular (or oval) box is a tool box on most foreign models) The sole purpose for the Pair Valve is to passively "Inject" fresh air into the exhaust system at the exhaust port, to cause ignition of unburned fuel vapor before it leaves the exhaust pipes, or to thin out the mixture with enough air to fool the sniffer machines. Unburned fuel vapors enter the exhaust system whenever you back off the throttle, or gear down. When you close the throttle, as in gearing down or slowing down, the drop in vacuum at the intake port allows the Pair Valve to relax and open and allow air from the air filter box to be "siphoned" into the exhaust port by the negative pressure at the exhaust ports. (there are reed valves in the pair valve to prevent backflow from the exhaust to enter the pair valve and airbox during roll-on and subsequent positive exhaust port pressure). __________________ ________________________________ "lomax" 2014 Voyager Mike Donahue Morinville, AB VBA#17 "Every day above ground is a good one!" _________________________________
	0

10-01-2008, 11:32 PM	#5
ringadingh Join Date: Aug 2007 Location: Newmarket Ontario Canada Posts: 35,387	Pair Valve I learned something new today. Never heard of it before. __________________ 2002 Nomad aka Bountyhunter VBA #27 VROC #18951 Login or Register to Remove Ads
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10-01-2008, 11:50 PM	#6
cactusjack Mega-Contributor Join Date: Sep 2007 Location: Where it doesn't snow...ever! Posts: 21,926	Pair Valve My 2005 C50T had a pair valve. It mounted in the area where our left side air filter assembly is. I know that de-PAIRing a Suzuki is a popular mod. __________________ Scott "Cactusjack" Hanks VBA #00105 H.O.G. #4250060 2011 H-D Ultra Limited 103ci :: 2011 HD Electra Glide Ultra Limited w/Stage 1 :: Rallies: Mesquite '08\|Custer '09\|Cortez '10\|Crescent City '11\|Kanab '12\|Antlers '12\|Estes Park '13\|Antlers '13\|Orofino '14\|The Dalles '17
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10-02-2008, 09:06 AM	#7
macmac Sr. Contributor Join Date: Apr 2008 Location: Tamworth New Hampster 06 1600 Posts: 12,484	Pair Valve Me too, as i said I never heard the term. lomax has a grip on it, and we do yank reed valves often. gadjets site has all the info on how to do so and why. http://www.gadgetjq.com/gadgetsfixitpage.htm __________________ 06 1600 Nomad Just call me Mac molon labe come and get it
	0

10-02-2008, 01:16 PM	#8
dogdoc Top Contributor Join Date: Jul 2007 Posts: 5,263	Pair Valve I never heard of a pair valve but I do have 2 pear trees in my yard! :-)
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10-02-2008, 03:05 PM	#10
blowndodge Sr. Contributor Join Date: Jul 2007 Location: Washington City, Utah Posts: 16,474	Pair Valve Isn't that the same thing as the hose that leads from the backing plate on the injectors to the exhaust that we marble sometimes?? __________________ I love my Victory Cross Country Tour 106. Smells like Victory! Ultra's are Limited There are two types of Harley riders. Those that trailer them and those that push them. The most Interesting Man in the World "Find the things in life you don't do well and don't do those things" Member # 0005
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10-02-2008, 09:08 PM	#12
skimo Member Join Date: Apr 2008 Location: Panama City, Florida Posts: 269	Pair Valve http://www.gadgetjq.com/rv_removal.htm http://www.gadgetjq.com/smogstuffremove.htm
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10-03-2008, 09:13 AM	#13
macmac Sr. Contributor Join Date: Apr 2008 Location: Tamworth New Hampster 06 1600 Posts: 12,484	Pair Valve Yes BD, it is similar in function.. I have never seen it with my eyes, but from what I read it is the same idea. On a car which I know you will know we called it EGR, only this adds fresh air to the exhaust, instead of recirculate exhaust into the intake. Bassakwards but more or less the same function. These days every one has a different word for everything.. The only pair of anything that counts to me is either in a holster, or on my wife's chest. Come to think of it, she has those holstered too. __________________ 06 1600 Nomad Just call me Mac molon labe come and get it
	0

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