Engine runs great when cold, then can't give it any throttle....

Discussion in 'Whizzer Motorized Bicycles' started by m3456y, Oct 12, 2014.

  1. m3456y

    m3456y New Member

    I'm trying to help my neighbor. His 1999 Whizzer runs perfect when first started, but as soon as it warms up, if you give it any gas it will die. We've swapped out the coil and CDI and it was not either of those. Any ideas?

  2. Paratrooper

    Paratrooper New Member

  3. jbcruisin

    jbcruisin Member

    loose valve seats? That's what happened to my 99 years ago. When it warmed up the valve seats came loose.
  4. m3456y

    m3456y New Member

    Sounds like that's it, based on reading a number of posts. Thanks JB
  5. jbcruisin

    jbcruisin Member

    I even changed my coil & CDI like you did when it happened to me . You don't expect your valve seats to fall out. If it happened to a car they'ed make them recall them & fix it.