Patent ID: 7055383

Claim:
A gear position sensor for a transmission, said transmission comprising a change pedal with a shift arm, a shift fork, a shift drum, a main shaft operatively connected via gears of the transmission to the shift drum, the shift drum being positioned laterally rearward of the main shalt and having an outer circumferential surface with a plurality of lead grooves formed thereon, wherein said shift drum is capable of being turned by stepping on the change pedal to transmit force through the shift arm, and the gears of the transmission are capable of being changed over by moving the shift fork in a left-right direction, said shift fork being engaged with the lead grooves of the shift drum, wherein: the gear position sensor is adapted to be mounted to the shift drum at a rear wall portion of a lower case of at least two cases which are formed by dividing, into upper and lower portions, a powertrain case formed by integrating a crankcase and a transmission case of an internal combustion engine.