MBK Yn 50

Discussion in 'Newbie Scooter Tuning' started by Chris Pearce, Sep 10, 2018.

  1. Chris Pearce

    Chris Pearce New Member

    Messages:
    3
    Rides:
    MBK 1999 Ovetto YN50
    Hi all

    I have a 1999 MBK YN50 which I inherited and have now decided to use to get to work. I know nothing about mopeds so some of my questions maybe common knowledge to some J

    I have derestricted this by changing to a stock derestricted exhaust pipe (non-sport) and removing the ring on the variator.

    As far as I know this is all that needs to be done.

    Questions while keeping the bike stock

    • Any other things that need to be done engine/carb wise?

    • Should the bike have a faint petrol smell? This as more noticeable when I pull up at the lights

    • Should a small amount of oil be noticeable at the rear of the exhaust and the seal with the manifold? The seal of the exhaust is good.
    thanks all
     

    Attached Files:

    Last edited: Sep 11, 2018
  2. Chris Pearce

    Chris Pearce New Member

    Messages:
    3
    Rides:
    MBK 1999 Ovetto YN50
    Well to answer part of my question the fuel line was leaking at the carb end so that's been replaced. But euro scooter parts sent a 5mm fuel line and the OEM was 6mm I've noticed a lower top end speed. would this make a difference?
     
  3. 4strokelover

    4strokelover Active Member

    Messages:
    375
    Rides:
    Longjia Raptor 200
    The fuel line will be 5mm as it has to stretch over the carb fixings so its fine.
    The oil from the exhaust tip/ manifold could be wrong fuel/oil ratio or spark plug on its way out and not burning hot enough to ignite all the mixture.
    Check the spark plug colour.
    I could be wrong with all this but its sort of the same symptoms as mine.
     
  4. scubabiker

    scubabiker NITROJUNKIE

    Messages:
    5,701
    Lighter rollers will change it a lot.
     

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