A throttle control device with an adjustable clamping mechanism for a handlebar of a vehicle, comprising: a throttle lever that forms an adjustable arcuate angle with respect to said handlebar and is pivotally movable relative thereto, the throttle lever provided to adjust an engine speed of said vehicle; and a clamp assembly that retains the throttle control device at a desired angular position upon said handlebar, the clamp assembly comprising: a body including a main section and a secondary section, the main section having a slot formed therein that is adapted to accept said handlebar, the slot including a first interior surface that is formed complimentary to a first portion of a circumferential surface of said handlebar, the secondary section being disposed in the slot and removable with respect to the main section, the secondary section having a second interior surface that is formed complimentary to a second portion of the circumferential surface of the handlebar; characterized in that, a clamping member is provided to exert a clamping force upon the main section and secondary section of the body, wherein, in an engaged position of the clamping member, the clamping member provides a clamping force between the main section and the secondary section and upon the handlebar sufficient to thereby retain the throttle lever in a predetermined angular orientation upon said handlebar during operation of said vehicle, and wherein, in a disengaged position of the clamping member, the clamping member does not provide the clamping force in order to permit the throttle lever to rotate about a longitudinal axis of said handlebar. a throttle lever that forms an adjustable arcuate angle with respect to said handlebar and is pivotally movable relative thereto, the throttle lever provided to adjust an engine speed of said vehicle; and a clamp assembly that retains the throttle control device at a desired angular position upon said handlebar, the clamp assembly comprising: a body including a main section and a secondary section, the main section having a slot formed therein that is adapted to accept said handlebar, the slot including a first interior surface that is formed complimentary to a first portion of a circumferential surface of said handlebar, the secondary section being disposed in the slot and removable with respect to the main section, the secondary section having a second interior surface that is formed complimentary to a second portion of the circumferential surface of the handlebar; characterized in that, a clamping member is provided to exert a clamping force upon the main section and secondary section of the body, wherein, in an engaged position of the clamping member, the clamping member provides a clamping force between the main section and the secondary section and upon the handlebar sufficient to thereby retain the throttle lever in a predetermined angular orientation upon said handlebar during operation of said vehicle, and wherein, in a disengaged position of the clamping member, the clamping member does not provide the clamping force in order to permit the throttle lever to rotate about a longitudinal axis of said handlebar. a body including a main section and a secondary section, the main section having a slot formed therein that is adapted to accept said handlebar, the slot including a first interior surface that is formed complimentary to a first portion of a circumferential surface of said handlebar, the secondary section being disposed in the slot and removable with respect to the main section, the secondary section having a second interior surface that is formed complimentary to a second portion of the circumferential surface of the handlebar; characterized in that, a clamping member is provided to exert a clamping force upon the main section and secondary section of the body, wherein, in an engaged position of the clamping member, the clamping member provides a clamping force between the main section and the secondary section and upon the handlebar sufficient to thereby retain the throttle lever in a predetermined angular orientation upon said handlebar during operation of said vehicle, and wherein, in a disengaged position of the clamping member, the clamping member does not provide the clamping force in order to permit the throttle lever to rotate about a longitudinal axis of said handlebar.