Intake air control system of v-type internal combustion engine

An intake air control system of a V-type internal combustion engine having cylinder axes formed in a substantial V-shape with a crankshaft provided therebetween, comprising:

• an operation input shaft turnably driven by an operator's input;
• an operation input shaft turning angle sensor that detects a turning angle of said operation input shaft;
• and
• a throttle body is formed with an air intake passage for each of a plurality of cylinders and includes a plurality of throttle valves, wherein
• said operation input shaft is located between valve shafts of a pair of the plurality of throttle valves that are disposed on opposing first and second bank portions of the V-type internal combustion engine, when viewed from the direction of the crankshaft,
• said operation input shaft is disposed separately from said throttle valve shafts;
• and
• said operation input shaft turning angle sensor is disposed at a shaft end of said operation input shaft.