Pair valve
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Thread: Pair valve

  1. #1
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    Default Pair valve

    Hey guys,has anyone done the block off of the pair valve?
    I've had a couple of bikes and just blocked off a hose to the aircleaner.
    Does that work on the C109, and if so which hoses do I block off?
    Don't want to pull the assembly off, ,just want the easy way out.
    Thanks


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  3. #2
    Very Active Member Bering_C_Sparky's Avatar
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    Never worked on a C109 before but it is the same engine as the M109R so I would assume the pair valve set up will be similar.
    (Of course we all know what happens when we assume )

    I made this quick video to show how I cap off the pair on the M109R.

    https://www.youtube.com/watch?v=ft-TYsaRkc8

    BCS
    Last edited by Bering_C_Sparky; 01-10-2019 at 02:05 AM.

  4. #3
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    Thanks for the video,really well explained.
    On to the tools

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  6. #4
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    I forgot to ask what size caps do I need and where do you get them?
    Thanks again

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  7. #5
    Very Active Member 4fun's Avatar
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    I foget as well but I followed his video a while ago and just went to a local auto parts store and got a pack of assorted rubber caps it will work its like 5 dollars
    Freedom Performance Exhaust, Exhaust Servo removed,O2 sensors Removed,PC V,Grasshopper seat rest,Rear seat backrest,USB Phone charger,Pair valve blocked off, LED light kit with remote, derby cover M109R,JDM switchbacks. JDM H4,M109R swing arm cover,Tank bra, Spike air intake with K-n"s, Quick disconnect rear seat back,quick disconnect cowl,














  8. #6
    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by beally55 View Post
    I forgot to ask what size caps do I need and where do you get them?
    Thanks again

    Sent from my SM-G965F using Tapatalk
    I do not know the size off the top of my head but I just purchase assorted kits from O'Reilly Auto Parts and they have all the correct sizes in them.

    Also if you have the spike type intakes there will be caps in this pack that will fit on the dummy breather connection that is not used to keep it from rubbing on your engine head.

    I may be doing another bike soon so I will try to get the sizes needed then for future reference.

    BCS

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    Why do people do this? Is there a link to an article where I can learn more?

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    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by Baldi View Post
    Why do people do this? Is there a link to an article where I can learn more?
    The PAIR system is installed on the bike for emissions purposes only and adds air on the exhaust stroke in lower RPM ranges.

    When you put aftermarket exhaust with no cat on your bike you may experience a lot of popping from your exhaust due to this air that is added by the PAIR.

    Also when you are tuning the bike you want your PAIR capped off so you are not getting skewed feedback from your O2 sensor in your exhaust due to the PAIR adding fuel into the exhaust stroke.

    Check out this video, it explains the PAIR system very well.

    https://www.youtube.com/watch?v=_xMykbzJWiQ

    BCS
    Last edited by Bering_C_Sparky; 01-10-2019 at 12:07 AM.

  11. #9
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    It stops the popping through the exhaust on deceleration .
    If you have standard pipes that are quiet you dont need to worry.
    It tidies up the engine bay if thats what you want, but there is no performance gain.

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    Thank you both for the explanation. My bike has an aftermarket exhaust (Freedom Combat) and cheap spike airfilters. I don't think it has any O2 sensors. There is some decel pop sometimes under very specific conditions: e.g. when I add throttle in traffic to get into a gap and then back off slightly to maintain speed, like a quick but slight acceleration and then back off to maintain the new speed. Interestingly it does not happen every time, just sometimes. I must also say that I tend to sort of short shift and maintain low rpm (about 2000 - 2500) in the city to keep the noise down, and not attract police attention. Most of my gear changes are at 3000 rpm in the city.
    Last edited by Baldi; 01-10-2019 at 03:50 AM.

  13. #11
    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by beally55 View Post
    I forgot to ask what size caps do I need

    • I did a ECU tune and PAIR block off for a Florida 9er today, the 2 reed housings each need a 3/8 vacuum cap and the solenoid needs a 1/2 inch vacuum cap.

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    Very Active Member FlyingCircus's Avatar
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    Quote Originally Posted by Bering_C_Sparky View Post
    • I did a ECU tune and PAIR block off for a Florida 9er today, the 2 reed housings each need a 3/8 vacuum cap and the solenoid needs a 1/2 inch vacuum cap.
    I used some electrician components, marettes AKA wire nuts

  15. #13
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    Quote Originally Posted by Bering_C_Sparky View Post
    • I did a ECU tune and PAIR block off for a Florida 9er today, the 2 reed housings each need a 3/8 vacuum cap and the solenoid needs a 1/2 inch vacuum cap.
    Would just blocking off the hose and the solenoid be ok?
    Dont really need to remove the hoses .

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  16. #14
    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by beally55 View Post
    Would just blocking off the hose and the solenoid be ok?
    Dont really need to remove the hoses .

    Sent from my SM-G965F using Tapatalk
    Yes you could pull the hose that comes from the solenoid off at the tee and stick a ball bearing, marble, wire nut or what have you in the hose and then put the hose back on the tee.....just have to make sure whatever you put in there is large enough to block it off 100%

    Or you could pull the tee out and fill the tee with epoxy then reinstall the tee after the epoxy is dry.

    But personally.....if it ain't serving a purpose, its not staying on my bike. No need to have that hose running taking up space if its not doing anything.

    Also just FYI .....everyone should check to see if your solenoid is loose on on the front of your air box. I have found 3 different bikes (including the one I did today) where the solenoid mounting screws have worked loose and the solenoid is hanging loose and not sitting tight to the air box. This will allow contaminants to to get into the air box and into your throttle bodies. So check em and get em tightened up if nessisary.

    BCS
    Last edited by Bering_C_Sparky; 01-11-2019 at 11:29 PM.

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    Thanks for that mate.
    Do you happen to know if the exhaust off a
    M109 fits a C109?
    My pipes have been gutted and are a bit loud for the local cops, and I am having trouble finding a good set.
    I have found a set of M109s but they are across the country (Australia)so I cant see if they fit.
    Appreciate your help.

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  18. #16
    Very Active Member Bering_C_Sparky's Avatar
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    Quote Originally Posted by beally55 View Post
    Thanks for that mate.
    Do you happen to know if the exhaust off a
    M109 fits a C109?
    My pipes have been gutted and are a bit loud for the local cops, and I am having trouble finding a good set.
    I have found a set of M109s but they are across the country (Australia)so I cant see if they fit.
    Appreciate your help.

    Sent from my SM-G965F using Tapatalk
    Honestly I have never put hands on a C109 yet.

    But I am 99.9% sure the exhaust is not the same.....if it were they would be advertised as such and you would see a lot of C109's running around with Side Burners and VPR pipes....LOL (and I have never seen that)

    BCS

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    Yeah I thought so.
    C 109s are a bit thin on the ground here.
    I can get a set locally but he wants far too much for them.
    Might have to try and fit some baffles as a last resort.

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  20. #18
    Very Active Member Bering_C_Sparky's Avatar
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    I kind of lost track that this thread is posted in the C109 section......so just wanted to add that I am not sure if the C109 PAIR is set up just like the M109R or not, so please confirm any info given here if anyone does this on a C109.

    Also I believe that some (if not all) of the European M109R's have 2 solenoids for the PAIR.....one for each head. So these may not have the tee that I am mentioning.

    I can only speak on M109R's made for North America......so if you are overseas, your bike may not be exactly the same for this mod.

    (I also think the European and Australian model M109R's are the same......but I can't confirm this I have only dealt with North American Models)

    If anyone finds their bike is different from what has been discussed please post that info here to share that info.

    BCS
    Last edited by Bering_C_Sparky; 01-11-2019 at 11:51 PM.

  21. #19
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    I'll have a play in the next couple of days and let you know.l

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  22. #20
    Very Active Member Andy33's Avatar
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    Been meaning to do this mod for years.
    Appreciate the video. This has motivated me to get on it this winter. Nice cheap mod to keep the wife happy.....

    Really want to use the block off plates and would like to remove the solenoid all together but would need to figure out how to seal off the air box under there.

    Now to see if I still have that block off plate template....
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