V-type two cylinder engine and straddle-type four wheel all terrain vehicle having it mounted thereon

A straddle-type four wheel all terrain vehicle comprising:

• a straddle-type seat;
• a steering handle provided forward of the seat;
• a top cover covering an upper portion of a vehicle body, through which a rotating shaft of the steering handle penetrates;
• and
• a V-type two cylinder engine mounted below the seat and the handle and between the seat and the handle, wherein
• the V-type two cylinder engine comprises:
• cylinders arranged forward and rearward such that they are inclined in V shape;
• a downdraft carburetor unit having at least two carburetors placed between the cylinders and including twin venturi bores provided for the respective cylinders and an air vent system making the interior of said carburetors communicate with the atmosphere;
• intake manifolds each connecting a venturi bore of each of the carburetors to an intake port of a corresponding cylinder;
• and
• an air cleaner placed above the carburetors such that it covers the carburetors, wherein
• the carburetor unit is placed obliquely seen in a plan view according to a positional difference between the cylinders in a direction of a crank shaft of the engine such that the venturi bore of each of the carburetors is closer to the intake port formed in a corresponding cylinder.