According to one embodiment, an automatic analyzer includes a reaction disc, cleaning mechanism, and cover. Each array receives print data from TAB films. The mounting structure includes a clamping member extending through a through-hole for fixing the main body on the seat, an engine-side engaging portion radially distanced from the axis of the clamping member and a bearing portion provided on the sensor and adapted to engage with the engine-side engaging portion. A drive unit is provided for automatically moving the actuator arm into one of the first and second positions in response to a signal from at least one of a timer, a sensor, and a manual switch. The throttle member is then attached or reattached to the handlebar thereby allowing the cruise control to control the motorcycle’s speed.