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Thread: Scooter bogging down on take off

  1. #1
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    12th January 2010 - 21:38
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    Scooter bogging down on take off

    Hi, a friend of mine has a scooter that, when taking off at the lights or whatever, has started to bog down a bit, not so far as to stall but just drops revs. He said that it seems to run fine once up to speed but the engine seems to struggle a bit when he first takes off.
    Im not too sure of the make, model, year or kms, but can get these if it would help.

    Any ideas?

    Thanks
    Never in the field of human conflict has so much been owed to so few by so many cheese eating surrender monkeys.
    (Winston Churchill on the French.)

  2. #2
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    13th February 2006 - 13:12
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    handbrake still on?

  3. #3
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    1st September 2007 - 21:01
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    The one's with the yellow power band do that ...
    When life throws you a curve ... Lean into it ...

  4. #4
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    Too many pies?

  5. #5
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    10th May 2009 - 15:22
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    Quote Originally Posted by Spazman727 View Post
    Any ideas?
    Could be a million things. How long since it was last serviced? Might just need a bit of love.

  6. #6
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    6th May 2012 - 10:41
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    centrifugal clutch = shat throwout springs.

  7. #7
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    9th May 2008 - 21:23
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    Apart from Akzle making sense...the things that cracked me up were: Scooter...and a friend of mine...really?

  8. #8
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    18th October 2007 - 08:20
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    Quote Originally Posted by Akzle View Post
    centrifugal clutch = shat throwout springs.
    Unlikely.

    The more common fault is the variator rollers (the plastic rollers between the front pulley and belt)

    These are a service item, and quite often inn NZ are ignored. if they get a flat spot (normal use this is a part that only lasts 5,000 or so miles, less in extreme stop start situations, tye scooter will suffer tye exact symptom you describe.

    Also, make sure the roller weights are tye correct weight, ,if they are too light, the symptom is the same.

  9. #9
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    2nd August 2012 - 21:01
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    Blah

    Don't want to look like the fool around here by knowing scooters but since I can't afford a bike and swear that's the only reason you'll find me on a scooter... these scooters almost all use carbs, not EFI, so it's either a blocked carb, or it's the mixture. water blocks these carbs pretty easily if he has a pod filter.. and they suck in dirt in any case. Open the carb and clean it is the best bet, and if it still does it adjust the mixture with the mixture screw located on the side of the carb... don't mistake it for the drainage screw by the pipe.

  10. #10
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    26th February 2009 - 06:43
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    I think SS90 is on the money. Whenever I start bogging a bit I know's time for new rollers and drive belt (every 5-6000km or so, but sliders last a bit longer). Good as new afterwards. When were these last replaced?
    Watch out for tow ropes and quickly braking cars

  11. #11
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    12th January 2010 - 21:38
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    Not sure when they were last replaced as it is my friends scooter, I'll ask him next time I see him, but it's probably been a good while since anything much was done,
    Thanks for all the replies.
    Never in the field of human conflict has so much been owed to so few by so many cheese eating surrender monkeys.
    (Winston Churchill on the French.)

  12. #12
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    12th May 2010 - 15:59
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    When its on the center stand, do you notice the same behavior when giving throttle? ie: does revs drop then gradually speed up when the throttle is wide open? If so, this might just mean the A/F ratio is too lean. I'd clean the filter and tune the carb (maybe replace the spark plug while you're at it before opening things up to check the rollers. My rollers are at 11,000km with only slight flat spots and I don't have this problem (but have delt with many A/f issues ) but I do plan on replacing the rollers when a new belt goes on soon.

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