Pair Valve Block off plate
Page 1 of 2 12 LastLast
Results 1 to 10 of 15
  1. #1
    Junior Member Speedfreak's Avatar
    Join Date
    May 2018
    Posts
    7
    Member #
    8746

    Pair Valve Block off plate

    what’s up everyone? I hope all is well. The reason why am making this post is to ask about the pair valve block off. I initially heard about it when I was going to take my motorcycle to get dyno tuned. The Mechanic mentioned that you don’t need to get block off plates, and that they use whatever ever they have lying around in the shop to throw in there. That is not something that I want to end up doing. I ended up ordering block off plates from grave. I was wondering if anybody has instructions on how to install them. The directions that they sent me are very generic. Also, does anybody have any ideas on how the pair valve system works? I know a little bit, but would like to hear everybody else’s opinions. Thank you in advance for your responses.

  2. #2
    Senior Member DELuth's Avatar
    Join Date
    Jun 2013
    Location
    South Mississippi
    Posts
    2,424
    Member #
    3037
    Liked
    764 times
    Simply disconnecting the solenoid accomplishes the same thing for free, doesn't require tools, and can be done and undone in seconds.

    The pair system is an air injection system that helps to lower emissions by burning un-burnt fuel in the exhaust. There is an electrical solenoid valve that the ECM opens to let fresh air in when conditions are correct. It draws that air from the airbox and that is the hose you always hear people talking about blocking off. Blocking that hose does the same thing as installing block off plates. Unplugging the solenoid does the same thing as blocking off the hose or installing plates. That solenoid valve is closed when no power is applied. No air is getting by it with it unplugged. It will not cause the check engine light to come on since it's not a monitored output.

    Block-off plates are best used when you are looking to de-clutter the system by removing the pair system entirely and never put it back on.

    If all you need to do is disable it for tuning, unplug the solenoid. When you are done tuning, plug it back in, easy! The pair will not affect running and causes the bike to pollute more so there's no advantage to leaving is disabled, but all that extra air in the exhaust does mess with the tuner's exhaust sniffer. If you want to install the plates, you can remove the rest of the pair hoses and solenoid for more room under there. The hose going to the airbox will need to be left in place and blocked off or removed and a plug installed in the airbox in it's place. If you don't do one of those, you will be sucking unfiltered air into the engine.

    Some say it can lessen some popping from the exhaust by leaving it disabled, but I've never been able to tell a difference myself. I don't know if it's the loud-ass exhaust I have or if it's a placebo effect people get from it, I just can't tell a difference.
    "I don't know how to put this, but I'm kind of a big deal. People know me. I'm very important. I have many leather-bound books and my apartment smells of rich mahogany."

    My Bike

  3. #3
    Senior Member Tifa's Avatar
    Join Date
    Dec 2007
    Posts
    321
    Member #
    15
    Pulled all the PAIR plumbing & solenoid off my Hornet a few years back.
    Tidied up the top of the engine. Used blanking plates, and took reeds out
    ISTR dropped about third of a Kg in weight.
    Stopped popping on over run & decel...dead.
    No increase in performance though.
    Boooo!

  4. Remove Advertisements
    HondaCB1000R.com
    Advertisements
     

  5. #4
    Junior Member Hambone's Avatar
    Join Date
    Jun 2018
    Posts
    15
    Member #
    8858
    Duluth, if I'm running autotune, can I keep this solenoid disconnected, or should I do the block off, either the plates or the hose? I just started installing the pcv and autotune. I just read about this. I'm kinda flying by the seat of my pants, and want to make sure I'm doing everything necessary. Running yoshi r77, if that matters. Sorry, I know this is an old post. I'm a noob, be easy. Thanks in advance.

  6. #5
    Senior Member DELuth's Avatar
    Join Date
    Jun 2013
    Location
    South Mississippi
    Posts
    2,424
    Member #
    3037
    Liked
    764 times
    Welcome to the forum, Hambone.

    Unplugging the solenoid does the same thing as blocking off the hose or installing plates.
    It will not cause the check engine light to come on
    Block-off plates = air can't get in
    Plugged hose = air can't get in
    Unplugged solenoid = air can't get in

    It's all the same to the engine/computer/PCV.
    "I don't know how to put this, but I'm kind of a big deal. People know me. I'm very important. I have many leather-bound books and my apartment smells of rich mahogany."

    My Bike

  7. #6
    Junior Member Hambone's Avatar
    Join Date
    Jun 2018
    Posts
    15
    Member #
    8858
    Thank you, Deluth. Now that you quote that, I remember reading it. Dont know why I still asked. Excuse me.

  8. #7
    Senior Member DELuth's Avatar
    Join Date
    Jun 2013
    Location
    South Mississippi
    Posts
    2,424
    Member #
    3037
    Liked
    764 times
    You are welcome. No excuse needed, though. Happy to help.
    "I don't know how to put this, but I'm kind of a big deal. People know me. I'm very important. I have many leather-bound books and my apartment smells of rich mahogany."

    My Bike

  9. #8
    Junior Member Hambone's Avatar
    Join Date
    Jun 2018
    Posts
    15
    Member #
    8858
    So... I ordered the plates anyway, just to clean it up a little. They weren't expensive. Well, in the process of trying to remove the stock plates, very first bolt broke. I know they have yellow lock tight on them, but it shouldnt have broke, right? Then next one is super tight too. I've extracted broken bolts before, but this one is going to be a PITA. There's too much stuff around to put any heat to it. Anybody else have this happen? I don't want to try the other ones now, but I'm kinda forced to. Open to any suggestions.

  10. #9
    Junior Member Hambone's Avatar
    Join Date
    Jun 2018
    Posts
    15
    Member #
    8858
    Shit. Just thought of something. Do I need to remove valve cover to remove the pair valves? They are accessible without, but now I'm wondering if they're thru bolted and that's why it broke. I feel so dumb right now.

  11. #10
    Senior Member Tifa's Avatar
    Join Date
    Dec 2007
    Posts
    321
    Member #
    15
    If they are like the 919 motor, then no.

Page 1 of 2 12 LastLast

Sponsored Links

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. pair valve removal
    By e-money in forum Modification
    Replies: 37
    Last Post: 07-19-2017, 03:31 PM
  2. The truth about pair valve and airbox flapper mods
    By IBleedHondaRed in forum Modification
    Replies: 23
    Last Post: 02-20-2016, 01:19 PM
  3. ASV pair of levers
    By phillcbx in forum Marketplace
    Replies: 3
    Last Post: 06-06-2015, 02:41 PM
  4. Wanted.Pair of hero blobs
    By Bald Bloke in forum Marketplace
    Replies: 3
    Last Post: 05-20-2015, 11:51 AM
  5. New kid on the block
    By Bullnose in forum Introductions
    Replies: 25
    Last Post: 12-05-2011, 07:51 AM

Search tags for this page

honda cb1000r block of plates forum

Click on a term to search for related topics.