Intake system for combustion engine

An intake system for a combustion engine, which comprises:

• an intake passage extending through a bottom wall of an air cleaner;
• a suction duct protruding into the intake passage to communicate therewith, and having front wall area on an upstream side of air flow in the air cleaner and rear wall area opposite to the front wall area;
• and
• a fuel injector positioned in the air cleaner so as to confront an inlet opening of the suction duct for injecting fuel into the suction duct;
• wherein the rear wall area has a height, measured along a longitudinal axis of the suction duct and from the bottom wall of the air cleaner, greater than a height of the front wall area, and
• wherein the rear wall area of the suction duct has an upper end held substantially at a level with or higher than a fuel injection port of the fuel injector.