PAIR valve - Kawasaki Versys Forum
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post #1 of 6 (permalink) Old 03-23-2011, 06:25 PM Thread Starter
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PAIR valve

Hey everyone. I am sorry to bring this up if it has been discussed but searching the forum for pair valve doesnt bring back the answer. I bought a yoshimura exhaust and it sounds like gun fire when i close the throttle or decelerate. Is it ok to just pull the hose that runs from the airbox to the top of the cylinder and plug it with something? Why remove the tank and plug the valve itself? It would be simple to plug the hose, but is that ok?
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post #2 of 6 (permalink) Old 03-23-2011, 08:37 PM
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Yes it's ok. Plug it up any way you like.
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post #3 of 6 (permalink) Old 03-24-2011, 10:28 AM
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gun fire

i had the cherry bomb muffler and it would do the same. plugging the pair valve had no effect. Adjusting the TPS might help. mine sounded like a shotgun and i would sometimes jump in my seat. if it has small popping on decel blocking the pair valve may help. i am thinking of trying the cherry bomb again. love that sound.
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post #4 of 6 (permalink) Old 03-24-2011, 05:54 PM
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Loose header pipes at the cylinder head will also cause backfires.

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post #5 of 6 (permalink) Old 03-25-2011, 11:09 AM
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I was waiting for a fresh PAIR thread.

I found that O'reilly's (and possibly other auto parts stores) carries the perfect item to block off the ends of the of the pair system. It's called a vacuum cap, and my guess is it's used on cars when people remove a vacuum powered item and want to close off the leak created by the removal.

You can pull the hose, and stick something in the hose to plug the airbox, then get a vacuum cap that is around 1/2" to 5/8" internal diameter and stick it on the nipple coming from the engine (the come in a box of random sizes for the large ones) Then clamp it down with a hose clamp that has a hand tightening key, for tool-less removal. This will give you can air tight seal to your engine.

Initially, I just stuck one of those cone shaped caps (for a Lucas bottle) in the engine side of the PAIR system, but it still let a little air through. Then I found the Vacuum caps and capped the engine. Then I removed both hoses from the PAIR valve because the airbox side of the PAIR system is on the filtered side of the airbox, and I didn't want to risk water or debris getting past the valve somehow if a plug fell out somehow. I plugged the airbox PAIR nipple with the same kind of vacuum cap and I left the PAIR module in place.

After I used a vacuum cap the decel pop was nearly gone. Occassionally you'll get like an Accel pop, or even a decel pop if you're coming down off the throttle hard, but I think I probably had similar sounds with the old exhaust, except they sounded quieter.

I attempted to remove the PAIR module and connect the two wires together. I still got a FI light, and the bike ran like ****, so I reconnected the PAIR module to the computer. It turns out that you need to short the system out with a resistor. I didn't want to go to radioshack and look for the right one, so I decided to leave the module in place.
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Last edited by snarky; 03-25-2011 at 11:12 AM.
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post #6 of 6 (permalink) Old 03-28-2011, 10:17 AM
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Do you have any pictures of the setup?

Top of Engine?

Under airbox?

So which one are we blocking when you mention the pair valve mod? Also, why do you need to take the tank off to get to it at either location?

Last edited by dsmisfits; 03-29-2011 at 12:56 PM.
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