Overfueling at high RPM
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Thread: Overfueling at high RPM

  1. #1

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    Overfueling at high RPM

    Hi all

    I need some advice with my 99 bb

    On a ride last sunday a friend following me said occasionlly at high rpm he could smell fuel from my bike a friend also said he could smell fuel from it on my commute to work the other day

    Theyre was no smell at idle and i cant smell it in the garrage or whilst riding

    The bike does have a remus aftermarket system fitted but no one has mentioned it before about a week ago.

    I belive an FPR is a common cause of over fueling but could it be anything else

    In total honesty its over due a service so old inefficant air filter ?

    Im going to spray water on the hedders tomorrow morning from a cold start which aparently indicates an ineffective FPR if 2 and 3 dont evaporate the water

    Any advice would be greatfully recived again

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  3. #2

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    Re: Overfueling at high RPM

    Check that you don't have a fuel smell in your oil - if you do, stop riding it or you will damage the engine becasue your oil is diluted with fuel.
    Then search FPR threads on here for more info about checking FPR.
    beestoys likes this.
    No good deed goes unpunished!

  4. #3

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    Re: Overfueling at high RPM

    Check the vacuum line (it's the smaller of the 2) for wetting inside. Sure sign it's leaking along with leighb's pointer as well. If the level is up your diluted shut it down before you take out the button end bearings.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

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  6. #4

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    Quote Originally Posted by beestoys View Post
    Check the vacuum line (it's the smaller of the 2) for wetting inside. Sure sign it's leaking along with leighb's pointer as well. If the level is up your diluted shut it down before you take out the button end bearings.
    Will check it tomorrow pal

  7. #5

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    Quote Originally Posted by leighb View Post
    Check that you don't have a fuel smell in your oil - if you do, stop riding it or you will damage the engine becasue your oil is diluted with fuel.
    Then search FPR threads on here for more info about checking FPR.
    Quite diffict at the moment due to hayfeaver cant really smell anything pal ive tried

  8. #6

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    https://www.davidsilverspares.co.uk/...t_16740MATE22/

    Also is this the correct one ? Cheers

  9. #7

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    Re: Overfueling at high RPM

    That is the FPR yes but that's the later version that will bump the rail pressure to 50 psi and require a power commander and mapping to get the fuel ratio back down to factory levels.
    On another note that small pipe is the one that connects to the line you need to check for wetness.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  10. #8

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    Quote Originally Posted by beestoys View Post
    That is the FPR yes but that's the later version that will bump the rail pressure to 50 psi and require a power commander and mapping to get the fuel ratio back down to factory levels.
    On another note that small pipe is the one that connects to the line you need to check for wetness.

    When serching on the fourm people have said that the one for the early fi bikes has been discontinued

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    Okay had the vent hose off seems dry and the end of the fpr is dry also switxhed ignition on to let the fuel pump prime and no leaks .....
    Attached Images Attached Images

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    Culprit maybe ?
    Attached Images Attached Images

  13. #11

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    Re: Overfueling at high RPM

    Could be what's it look like when you hold it up to the sun looking through it?

    Very likely to be true parts are starting to become unobtainable. If you do install the newer one do a plug check after about 100 miles and see where they end up color wise. You want a light tan to grey.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  14. #12

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    Quote Originally Posted by beestoys View Post
    Could be what's it look like when you hold it up to the sun looking through it?

    Very likely to be true parts are starting to become unobtainable. If you do install the newer one do a plug check after about 100 miles and see where they end up color wise. You want a light tan to grey.
    I will see tomorrow due to it being nighttime here

    Dont think ill change the fpr as it seems fine

  15. #13

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    Re: Overfueling at high RPM

    If putting standard filter in doesn't sort it, try a performance filter, they tend to run weaker, may make for an easy fix?
    beestoys likes this.
    The answer is 42

  16. #14

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    Re: Overfueling at high RPM

    Agree with what Kris says. The flow increase may lean it out just enough.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  17. #15
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    Re: Overfueling at high RPM

    As a side note to the fixes given above when my wife follows my 99 (inj) Bird she always comments 'your bike stinks'. She said the same after following a mate on a 99 Thundercat. This saying has become a bit of a joke with other friends asking her if their bikes stink!

    '99 Birds do not of course have any forms of emissions control (neither does the Thundercat) and I'm wondering if the smell is simply due to the age of the bike and the lack of emissions control. FWIW the FPR on my bike is good, the air filter clean, plugs are the correct colour when pulled and it doesn't burn oil.
    Full of Hot air? Intercool yourself............ you know it makes sense


 
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