The intake structure for an internal combustion engine includes: a collision surface (25) configured to face an inlet (4) of a carburetor (3); a deflecting surface (29) configured to deflect a blowback flow, which is to diffuse after colliding against the ...

When a motorcycle 1 is viewed laterally, a concave region 12 is formed rearward of a head pipe 3, forward of a seat 9 and above a main frame 4. A throttle body 44 is provided at its lower end portion with a lower connection opening 44a connected to a first...