A speed limit assembly for a vehicle includes a cam member having varying thickness, a frictional member, and a handle. The frictional member maintains sufficient frictional forces to resist movement of the cam member during ordinary operation of the vehicle. The handle may be manipulated by an operator of the vehicle to overcome the friction created by the frictional member and move the cam member into a desired position. A portion of a speed control handle on the vehicle abuts against the cam member to define an end of the range of motion of the speed control handle. A desired permitted range of motion may be set by moving the a portion of the cam member having a corresponding thickness into the path of the portion of the speed control handle.