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Thread: Fuel pouring out of airbox + running lean

  1. #11
    Junior Member travelrider73's Avatar
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    I found this piece of advice on a forum for a different motorcycle while using Google. Is this a possibility with the TW200?
    "What is happening is the primary jet is clogged with crap and the system is trying to sook the fuel up through the main jet. This is causing the airbox to fill with fuel"
    I doubt this is the issue since the fuel leaks even when turned off, but I thought I'd add this to be sure.
    Family Toys...
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  2. #12
    Senior Member JerseyJeeper's Avatar
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    I don't think that applies.

    On the top of the needle valve is a little pin, the one you hooked on the float. That's supposed to be spring loaded. Is yours spring loaded and does it operate smoothly?

    With the float attached to the carb and with the bowl off turn the carb upside down so the valve closes. When it's in this position when you blow air in a hose attached to the fuel inlet on the carb is the valve sealed or leaking air when blowing hard?

    dies the needle assembly move smoothly in the seat or dies it bind.

    there really is not much that can cause this.
    XT225 Serow... ON THE WAY TO ME NOW!!!! Yay
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  3. #13
    Junior Member travelrider73's Avatar
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    Quote Originally Posted by JerseyJeeper View Post
    On the top of the needle valve is a little pin, the one you hooked on the float. That's supposed to be spring loaded. Is yours spring loaded and does it operate smoothly?
    Yes, and yes.

    Quote Originally Posted by JerseyJeeper View Post
    With the float attached to the carb and with the bowl off turn the carb upside down so the valve closes. When it's in this position when you blow air in a hose attached to the fuel inlet on the carb is the valve sealed or leaking air when blowing hard?
    Define hard. It's definitely leaking air at about 60psi with the air compressor. If that's a problem, then what's happening? This seems like a simple part.

    Quote Originally Posted by JerseyJeeper View Post
    dies the needle assembly move smoothly in the seat or dies it bind.
    Does not bind.
    Family Toys...
    -2007 Yamaha TW200
    -2007 Yamaha FJR1300
    -2005 Honda Goldwing GL1800
    -2004 Yamaha FJR1300
    -2004 Suzuki SV650
    -1982 Honda CBX
    -and a couple of ATVs

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  5. #14
    Junior Member travelrider73's Avatar
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    Update. I took a close look at the old needle vs the new needle and they are just ever so slightly different, so I put the old needle in the new needle assembly and it seems to (maybe) not be leaking. I swear I still feel a touch of air at 60psi, but again, I'm not sure what you meant by "blowing hard". Thoughts?
    Family Toys...
    -2007 Yamaha TW200
    -2007 Yamaha FJR1300
    -2005 Honda Goldwing GL1800
    -2004 Yamaha FJR1300
    -2004 Suzuki SV650
    -1982 Honda CBX
    -and a couple of ATVs

  6. #15
    Senior Member JerseyJeeper's Avatar
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    60 lb., I meant blow with your mouth on the hose.
    XT225 Serow... ON THE WAY TO ME NOW!!!! Yay
    TW200Z - 2010
    BW200 - 1986
    TTR225R - 2003
    Husqvarna 701 - 2017

  7. #16
    Senior Member JerseyJeeper's Avatar
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    Set float level per the manual
    Fred likes this.
    XT225 Serow... ON THE WAY TO ME NOW!!!! Yay
    TW200Z - 2010
    BW200 - 1986
    TTR225R - 2003
    Husqvarna 701 - 2017

  8. #17
    Junior Member travelrider73's Avatar
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    Quote Originally Posted by JerseyJeeper View Post
    60 lb., I meant blow with your mouth on the hose.
    OK, so just in case that's what you meant, I did try that too... All new parts, it was leaking a little. New seat with old needle, no leak.
    So, even if that means this may be fixed, I possibly have a new problem.
    The rubber plug fell out (the one that's in the other hole that's near the main and pilot jets) -- I think this is a choke fuel pickup, right? Well, the plug is old and hard and won't stay in now. Is it absolutely necessary? If so, my project is on hold until I go buy a new plug unless you have some miracle rubber restoration idea.

    (Thanks for all your help so far!!!)
    Family Toys...
    -2007 Yamaha TW200
    -2007 Yamaha FJR1300
    -2005 Honda Goldwing GL1800
    -2004 Yamaha FJR1300
    -2004 Suzuki SV650
    -1982 Honda CBX
    -and a couple of ATVs

  9. #18
    Junior Member travelrider73's Avatar
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    Quote Originally Posted by JerseyJeeper View Post
    Set float level per the manual
    Done (as close as I can with the crappy ruler I'm using).
    Family Toys...
    -2007 Yamaha TW200
    -2007 Yamaha FJR1300
    -2005 Honda Goldwing GL1800
    -2004 Yamaha FJR1300
    -2004 Suzuki SV650
    -1982 Honda CBX
    -and a couple of ATVs

  10. #19
    Senior Member JerseyJeeper's Avatar
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    Quote Originally Posted by travelrider73 View Post
    OK, so just in case that's what you meant, I did try that too... All new parts, it was leaking a little. New seat with old needle, no leak.
    So, even if that means this may be fixed, I possibly have a new problem.
    The rubber plug fell out (the one that's in the other hole that's near the main and pilot jets) -- I think this is a choke fuel pickup, right? Well, the plug is old and hard and won't stay in now. Is it absolutely necessary? If so, my project is on hold until I go buy a new plug unless you have some miracle rubber restoration idea.

    (Thanks for all your help so far!!!)

    You should be able to buy a big thick o-ring and cut a piece to stick in their. Get a Viton o-ring they are gas resistant/proof. They make them real thick. A diesal shop or hose shop should have one. Heavy equipment uses thick o-rings.
    Smitty Blackstone and Peterb like this.
    XT225 Serow... ON THE WAY TO ME NOW!!!! Yay
    TW200Z - 2010
    BW200 - 1986
    TTR225R - 2003
    Husqvarna 701 - 2017

  11. #20
    Senior Member JerseyJeeper's Avatar
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    I'm not sure if it's necessary actually..? Never had an issue with it staying in.
    XT225 Serow... ON THE WAY TO ME NOW!!!! Yay
    TW200Z - 2010
    BW200 - 1986
    TTR225R - 2003
    Husqvarna 701 - 2017

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