Kolher rep. said the motor throttle cable was sucking air. Due do this they will not warranty this to be fix. If the throttle was not on this motor how would you use it. Maybe put a rope on it and pull when u need the power. This is the DUMBEST thing i have heard since i been in business for 23 years. This exmark NEW LAZER Z. Kolher said it is Exmark fault and exmark said it is Kolher fault. So if you buy any mower with a Kolher or Exmark on it make sure you know the warranty just sucks whoever fault it is.