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Thread: XB9S out of power

  1. #1

    XB9S out of power

    Hi.

    What are typical signs of clogged fuel injectors? My XB9 wont rev properly, almost impossible to get over 5000 rpm. It is like it hesitates or starve, also some hesitation at 2000 rpm.

    I checked the fuel pressure and it was around 3,1-3,5 bars, seemed to flow good. I plan to clean the injectors in my brothers shop, he has a special equipment for such. Can the pump be bad even if giving those values?

  2. #2
    Senior Member Barrett's Avatar
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    Quote Originally Posted by Fredrikrosen View Post
    Hi.

    What are typical signs of clogged fuel injectors? My XB9 wont rev properly, almost impossible to get over 5000 rpm. It is like it hesitates or starve, also some hesitation at 2000 rpm.

    I checked the fuel pressure and it was around 3,1-3,5 bars, seemed to flow good. I plan to clean the injectors in my brothers shop, he has a special equipment for such. Can the pump be bad even if giving those values?


    Can the pump be bad even if giving those values?

    YES.
    tell-tale signs that the pump needs serviced:
    excessive crank-to-start times particularly on over-nite or longer cold start
    lazy throttle response
    rolling on the throttle coming out of moderate turns results in engine stumbling
    back-firing thru TB into airbox assembly
    continuous climbing AFV value
    odd/unusual/abnormal sounds coming from either the pump motor itself or the frame/tank area
    erratic warm engine curb-idle speed

  3. #3
    Senior Member
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    You can buy a really nice rebuilding kit for your fuel pump from ^^^^^^^^^^^^^^^^^^^guess who!

  4. #4
    Quote Originally Posted by Barrett View Post
    Can the pump be bad even if giving those values?

    YES.
    tell-tale signs that the pump needs serviced:
    excessive crank-to-start times particularly on over-nite or longer cold start
    lazy throttle response
    rolling on the throttle coming out of moderate turns results in engine stumbling
    back-firing thru TB into airbox assembly
    continuous climbing AFV value
    odd/unusual/abnormal sounds coming from either the pump motor itself or the frame/tank area
    erratic warm engine curb-idle speed
    Barrett,

    So far no back-firing but out of power and not reving properly. Can the TPS be the issue? Will clean the injectors and remove the fuel pump, i found rebuild kits on ebay which include new pump, regulator etc for about 100€?

  5. #5
    Quote Originally Posted by njloco View Post
    You can buy a really nice rebuilding kit for your fuel pump from ^^^^^^^^^^^^^^^^^^^guess who!
    Thanks for the offer, i will pm you if needed. Problem is high shipping cost and toll fee’s when buying from USA. I wish a trade deal would come.

  6. #6
    Quote Originally Posted by Barrett View Post
    thanks kenny for the kudos.

    fredrik: can't answer your TPS question as i've only ever reset a few of them and that was because of either a questionable idle...or TPS replacement that necessitated a reset. the ECM experts on here can answer. i'm not one of them.
    regarding your pump...you can simply freshen it up if you're so inclinded. often times that restores good rideability, fuel mileage, cold start and erratic idling problems, and improved throttle response.
    a "refresh" simply involves removal and replacement of:
    fuel inlet sock filter
    high pressure fuel filter
    pump housing-to-frame O-ring seals----QTY 2
    drain plug O-ring seal---QTY 1
    fuel level sensor---QTY 1
    high pressure fuel supply line
    regulator and pair of O-ring seals for same

    the total of the above is not expensive and money well spent.
    Barrett,

    Can the parts in the link be a alternative?

    https://www.highflowfuel.com/i-35469...p0130-5a8.html
    Last edited by Fredrikrosen; 06-25-2020 at 05:15 PM.

  7. #7
    I removed the fuel pump today, it was in a very clean shape. No dirt in the fuel tank more than a black coat inside. Is there any way to check to pumps function? Or is it best to overhaul the unit preventively?

    1FB646C9-1C2B-4669-905E-0DBE46502965.jpg

    A8CE01AC-4266-4513-9924-656D5CA9C126.jpg

  8. #8
    Senior Member BuellyBagger's Avatar
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    Just my humble opinion... If you've already done the work of removing it just do the overhaul. Money well spent I'd bet.

  9. #9
    Quote Originally Posted by BuellyBagger View Post
    Just my humble opinion... If you've already done the work of removing it just do the overhaul. Money well spent I'd bet.

    I agree, any suggestion what to change in a fuel pump overhaul except the filter?

  10. #10
    Senior Member Endopotential's Avatar
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    Quote Originally Posted by Barrett View Post
    fuel inlet sock filter
    high pressure fuel filter
    pump housing-to-frame O-ring seals----QTY 2
    drain plug O-ring seal---QTY 1
    fuel level sensor---QTY 1
    high pressure fuel supply line
    regulator and pair of O-ring seals for same
    the total of the above is not expensive and money well spent.
    You've already got the answer right here. The more old parts you replace, the better. On my bike, turned out that there was a tiny hole in the flex hose, so the pressurized fuel would just spit back out into the tank.

    You've already done the hard work of getting the pump out of the bike, so may as well do it right.

    You should look into replacing the pump motor itself as well. There are threads here about how to check pump function outside of the bike, but they seem like a lot of work for a relatively cheap part.



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