INTAKE SYSTEM OF ENGINE IN MOTORCYCLE AND MOTOR-TRICYCLE

摘要

PROBLEM TO BE SOLVED: To improve engine output and low fuel consumption by effectively reducing intake air resistance of an air intake system in an engine of a motorcycle and a motor-tricycle. SOLUTION: In these motorcycle and motor-tricycle for mounting the engine E on a car body frame 15 by setting the axis of a cylinder bore 35a of an engine body 33 almost horizontal, a throttle body 46 is interposed in the middle of the air intake system 47 reaching an inlet port 38 of a cylinder head 36 from an air cleaner 23 arranged above the cylinder head 36, and the air intake system 47 is constituted so as to descend downstream at a steep gradient.