Help needed please

Discussion in 'Newbie Scooter Tuning' started by bradley220976, Feb 26, 2018.

  1. bradley220976

    bradley220976 New Member

    1. [​IMG]
      bradley220976New Member
      Hi all. I own a Yamaha jog RR and I have a problem with it. When the bike first starts (on the dot) it will drive amazingly but as soon as it warms up the bike is awful. The throttle will rev the bike and after the rev it will lose all power and cut out.
      Can anyone please help ?
  2. typh-gilly99

    typh-gilly99 Member

    Typhoon 125 2T
    Sounds like your choke is faulty or your idle mixture screw needs adjusting. Wind the idle screw on carb all the way in, then wind back out 2 turns. See if that makes a difference?
  3. Stevep

    Stevep Well-Known Member

    With the choke on at first start up it is getting more fuel and less air, i.e running richer.
    When the engine warms up and the choke turns off, it's getting more air and less fuel.
    So, guess what.................
    Up-jet the carb by one or two sizes.

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