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  1. #1
    Oily
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    Default What is a Air Suction Valve and what does it do?

    Was checking the shims on the weekend on the VN800 and when I took off the headcover there is a Reed valve or air suction valve that sits on the head casing with the gasket. Can anyone please explain to me what this does and what I should do it before reinstalling it.
    Also is there a proper way round to install it as I cant find much info in Clymer
    Thanks

  2. #2
    Really Full Of It


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    Googled this Oily & found on another site " ie: i'm not telling you this is gospel"




    10-12-2009 #2
    GREENISBEST
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    You may find one of the Air Suction Valves under the cam covers are sticking as it's stood for a while.

    It's (F) in the picture, One in each cover..

    Last edited by GREENISBEST; 10-12-2009 at 02:08 PM.

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    10-12-2009 #3
    jwnmj87
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    You are absolutely correct. After three years, everything was gunked up. The carb. was one piece of varnish. Even the neutral kickstand switch stayed depressed when I pulled up the kickstand. Do you think a little bit of Marvel Mystery Oil in the engine would help? Or, do you think I might be looking at a teardown? Why would the engine run great at idle and acceleration but not deceleration? What about the air/fuel mixture?

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    10-12-2009 #4
    GREENISBEST
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    Marvel Mystery Oil Ummmm not heard of that in the UK....Sounds like a Comic Book Additive So i am unable to recommend or advise against it's use....But someone here will know it's every molicule...Fingers crossed.

    It's hard to diagnos as the bike has sat for quite some time and there's alot of variables that could be causing your issue.

    You might even find riding it will improve matters partially or completly.

    I would go back and make sure everythings back in the right place as the carbs and associated parts have been off for cleaning.

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    10-13-2009 #5
    zoro
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    The mystery oil will help clean the crankcase, but breaks down the oils lubricating efficiency, so dont run it long before changing the oil! I would purchase two cans of SeaFoam, dump 1/2 of a can in the gas tank per tankful of gas. Pull the valve covers, pour a little SeaFoam in a small cup and with an old toothbrush, clean the gunk from the reed valves. Be vary careful with the reeds as they are fragile! Carburetter cleaner will also work to loosen the build-up but does not condition the valves or the rubber seals on the reed plate assemblies like the SeaFoam will. Make sure you have tight seals at the exhaust ports where the pipe meets the heads, any leaks there will cause backfiring through the pipes. Your problem dont sound carb or jet related so chill out and give the "tune-up in a can" a chance to clean the system. Good Luck, keep us updated or well send in the SARs and the SADs!
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  3. #3
    n00bie On a Mission


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    hi oily have them on my bike they let air into exhaust port on decel for emission control makes bike pop when you back off
    > you don,t need a reason to ride- just ride <

  4. #4
    Oily
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    Thanks guys, I pulled off the headcover and gave the reeds a good clean as they were heavily carboned up.

  5. #5
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    Pollusion crap. get rid of it, you don't need it
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    Quote Originally Posted by zxrmad View Post
    ......Pollusion crap. get rid of it, you don't need it......
    spot-on - this is common for heaps of late-model kawasaki's, its called the KLEEN system on bigger sports bikes, not sure about the cruisers ? Its garbage, one of the first mods that most ZX10R and ZX12R owners ever did was plug up the KLEEN system. It removes a lot of plumbing above the cam cover, and you get more accurate AFR readings when tuning on the dyno. Not much HP gain, but getting rid of this system will also get rid of the popping and banging on decceleration from high revs......


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  8. #8
    Oily
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    Quote Originally Posted by Gosling1 View Post
    spot-on - this is common for heaps of late-model kawasaki's, its called the KLEEN system on bigger sports bikes, not sure about the cruisers ? Its garbage, one of the first mods that most ZX10R and ZX12R owners ever did was plug up the KLEEN system. It removes a lot of plumbing above the cam cover, and you get more accurate AFR readings when tuning on the dyno. Not much HP gain, but getting rid of this system will also get rid of the popping and banging on decceleration from high revs......

    So Gos are you suggesting the removal of the Reed Valve would improve performance?

  9. #9
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    Quote Originally Posted by gpz750turbo View Post
    .....Does the Rex have the above mentioned Gos?.....
    pretty sure it does mate, but I have not poked around under the hood of a Rex lately - if you can see any plumbing coming from the top of the cam-cover - hoses etc - this will be the KLEEN system.


    Quote Originally Posted by Oily View Post
    ......So Gos are you suggesting the removal of the Reed Valve would improve performance?......
    not so much by virtue of just removing it and using blank-off plates......what it does do is allow a better measurement of the AFR on a dyno, because none of the combustion products are being re-cycled into the induction sytem. Getting rid of the snap crackle and pop on the over-run is probably the biggest improvement, together with allowing a lot better access under the tank. On a ZX12R - every little bit helps


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  10. #10
    Oily
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    Quote Originally Posted by Gosling1 View Post
    pretty sure it does mate, but I have not poked around under the hood of a Rex lately - if you can see any plumbing coming from the top of the cam-cover - hoses etc - this will be the KLEEN system.




    not so much by virtue of just removing it and using blank-off plates......what it does do is allow a better measurement of the AFR on a dyno, because none of the combustion products are being re-cycled into the induction sytem. Getting rid of the snap crackle and pop on the over-run is probably the biggest improvement, together with allowing a lot better access under the tank. On a ZX12R - every little bit helps

    Thanks mate thats another beer I owe you when we get over there.....not long now

 

 

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