Patent ID: 8464688

Claim:
A method for internal combustion engines that have maximum air flow rates different from one another, and each includes a throttle body comprising an air-intake throttle valve comprising a body portion having an air-intake passage formed therein, the method comprising: determining, in advance, pre-specified amounts of an opening degree of throttle valves in a full-open state to correspond to the maximum air flow rates of respective internal combustion engines, so that each of the throttle valves assumes a variable position with respect to an air flow direction of the air-intake passage based on the pre-specified amounts of the opening degree that are determined in advance to correspond to the maximum air flow rates of each of the internal combustion engines; inserting an adjusting screw from an outside of the body portion of a corresponding throttle valve to abut against a lever portion in the body portion; adjusting, with the screw, the opening degree of the corresponding throttle valve in the full-open state to the pre-specified amount of the opening degree, determined in advance for the respective internal combustion engine which is to accommodate a corresponding throttle body comprising the corresponding throttle valve; and interlocking the lever portion with a decelerating mechanism which rotates a valve shaft attached to the corresponding throttle valve by a motor and varies an opening area of the air-intake passage.