Scooter misfire at speed, Help Please!




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  1. #1
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    Default Scooter misfire at speed, Help Please!

    Hi All
    My daughters scooter has developed a missfire at speed.
    Starts and reaches about 50kph no problem but as soon as you go any faster is boggs and missfires.
    I have checked the following.

    1. Vacuum hoses
    2. Pet cock
    3. Coil and plug lead
    4. Plug
    5. Inlet manifold (leaks)
    6. Carb cleaned
    7. Mixture set

    No luck, still won't go. Any advise on what to check next?
    Thanks

  2. #2
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    Default Re: Scooter misfire at speed, Help Please!

    Blocked/Dirty fuel filter perhaps causing fuel starvation at speed.
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  4. #3
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by MarcoP View Post
    Blocked/Dirty fuel filter perhaps causing fuel starvation at speed.
    Thanks Marco, forgot to mention that I checked that, even bypassed the filter... no luck

  5. #4
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    Default Re: Scooter misfire at speed, Help Please!

    Check the exhaust for carbon......
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  7. #5
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    Default Re: Scooter misfire at speed, Help Please!

    Could be that the stator isnt able to provide enough spark at those revs?

  8. #6
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    Default Re: Scooter misfire at speed, Help Please!

    Did you check the filter/gauze in the Pet cock as well?
    99 Mitsubishi Pajero SWB 3.5 V6 Blister 4X4
    11 VW Amarok 2.0 BiTDi 4Motion D/C
    10 BMW 135i ///M (platkar)
    Bush Pig Off-road Trailer
    Ex: 11 Mitsubishi Triton 3.2 D/C 4X4
    Ex: 08 Mazda BT50 Crdi D/C 4X4
    Ex: 06 Ford Ranger 2.5 D/C 4X4
    Ex: VW Syncro 4X4

  9. #7
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    Default Re: Scooter misfire at speed, Help Please!

    Regrettably I have no choice but to offer the following honest advise.

    Change the sparkplug and buy better quality 2SO, not forecourt Jasco FC rubbish.

    Or resign yourself to misfires, fouled plugs and changing plugs regularly.

    That's honest opinion. I may not know a lot about 2SO in Turbo Diesels, But i know a $hit&oad about 2SO in two
    stroke engines.

    --------------------

    If on the other hand the scooter is a 4 stroke, forget the above comments in your case.
    Cheers

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  10. #8
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by Fluffy View Post
    Regrettably I have no choice but to offer the following honest advise.

    Change the sparkplug and buy better quality 2SO, not forecourt Jasco FC rubbish.

    Or resign yourself to misfires, fouled plugs and changing plugs regularly.

    That's honest opinion. I may not know a lot about 2SO in Turbo Diesels, But i know a $hit&oad about 2SO in two
    stroke engines.

    --------------------

    If on the other hand the scooter is a 4 stroke, forget the above comments in your case.
    Thanks Fluffy, it is a Four Stroke

  11. #9
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by MarcoP View Post
    Did you check the filter/gauze in the Pet cock as well?
    Hi Marco, yes cleaned that when I cleaned the fuel tank

  12. #10
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by MartinBravo View Post
    Could be that the stator isnt able to provide enough spark at those revs?
    I will have to check that, Could it be the CDI? Or do either they work or not work at all?

  13. #11
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    Default Re: Scooter misfire at speed, Help Please!

    Coming from a KTM that could do all sorts of weird and wonderful things..
    Have you checked the state of the battery?
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  14. #12
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by jelo View Post
    Check the exhaust for carbon......
    Thanks Jelo. will do that!

  15. #13
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    Default Re: Scooter misfire at speed, Help Please!

    Lots of Yoootoobs on making your scooter go faster by deristricting it ?

    Might be worth a look.........
    There is no task too simple for some people to complicate !



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  16. #14
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by hcs View Post
    Coming from a KTM that could do all sorts of weird and wonderful things..
    Have you checked the state of the battery?
    Mmmm... seems fine, but I will swop out with my bikes battery and check, you never know...

  17. #15
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    Post Re: Scooter misfire at speed, Help Please!

    Nope. i have had it where it wasnt providing enough and would almost go into a rev limiter type situation, the bike should be able to rev free through the range.maybe its chucking spark away somewhere too?

  18. #16
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by duncang View Post
    Lots of Yoootoobs on making your scooter go faster by deristricting it ?

    Might be worth a look.........
    Thanks Marco I will have a look, I have searched youtube for my specific problem but have tried all the fixes I could find without luck

  19. #17
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by MartinBravo View Post
    Nope. i have had it where it wasnt providing enough and would almost go into a rev limiter type situation, the bike should be able to rev free through the range.maybe its chucking spark away somewhere too?
    Thanks Martin, will have a look

  20. #18
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    Default Re: Scooter misfire at speed, Help Please!

    Another thing to recheck or perhaps just refit is the spark plug.
    I fitted new plugs to my bike and one new plug was a dud. Bike ran rough and would also misfire a bit. Changed the plug and all sorted again
    Somewhere in between Land Rovers
    Honda Africa Twin

  21. #19
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    Default Re: Scooter misfire at speed, Help Please!

    Quote Originally Posted by hcs View Post
    Another thing to recheck or perhaps just refit is the spark plug.
    I fitted new plugs to my bike and one new plug was a dud. Bike ran rough and would also misfire a bit. Changed the plug and all sorted again
    Thanks hcs, It is worth a try!

  22. #20
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    Default Re: Scooter misfire at speed, Help Please!

    Sounds like your ignition coil is breaking down.

    Have you cleaned the airfilter recently?
    Any minority that advocates for gun control is either wilfully ignorant, or has never opened a history book.

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