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In a motorcycle, the vehicle body frame includes main frames which are inclined rearwardly and downwardly directly towards a rear portion of a vehicle body from a head pipe with the engine being arranged close to an inclined portion of the vehicle body frame and the fuel injection device is overlapp

In a motorcycle, the vehicle body frame includes main frames which are inclined rearwardly and downwardly directly towards a rear portion of a vehicle body from a head pipe with the engine being arranged close to an inclined portion of the vehicle body frame and the fuel injection device is overlapped to the main frames. In a fuel injection type engine including a cylinder head, a throttle body has an intake passage leading to an intake port and a fuel injection valve which injects fuel towards the intake port, the throttle body can be arranged close to a cylinder head and, at the same time, the fuel injection valve can be cooled effectively. A connecting sleeve portion projects further outwardly relative to a joint portion of a cylinder head and a head cover and forms an inlet portion of an intake port that is integrally formed with the cylinder head.

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What is claimed is: 1. A fuel injection type engine for a motorcycle, comprising: a cylinder having a cylinder axis which is arranged substantially in a vertical direction; a cylinder head arranged above the cylinder and having an intake port formed therein; a head cover; a connecting sleeve portio

What is claimed is: 1. A fuel injection type engine for a motorcycle, comprising: a cylinder having a cylinder axis which is arranged substantially in a vertical direction; a cylinder head arranged above the cylinder and having an intake port formed therein; a head cover; a connecting sleeve portion projecting rearwardly relative to a joint portion of the cylinder head and the head cover, the connecting sleeve portion forming an inlet portion of the intake port; a throttle body having an intake passage leading to the intake port; an insulator provided between the throttle body and the connecting sleeve portion for connecting the throttle body to the connecting sleeve portion; a fuel injection valve for injecting fuel toward the intake port; wherein the connecting sleeve portion is integrally formed with a rear side of the cylinder head in a manner such that the insulator and the throttle body are arranged rearward of the cylinder head, and wherein each of the intake port, the insulator, and the throttle body has an axis that is arranged on a plane (PL2) which is substantially horizontal, the axis (L3) of the intake port extending in a direction which is parallel to a lengthwise direction (LL) of the motorcycle, and the axis (L2) of the throttle body extending in a direction at an angle relative to the lengthwise direction (LL) of the motorcycle, so that a rear end of the throttle body is offset to one side of a cushion unit. 2. The fuel injection type engine for a motorcycle according to claim 1, wherein the insulator is formed with a curve, and the curve is arranged on the plane (PL2), and further comprising a throttle drum arranged outwardly from the body of the intake passage, the throttle drum adapted to rotate together with the throttle valve, the throttle drum being arranged on one side of the intake passage body, and the throttle body being arranged at opposite side of the intake passage body. 3. The fuel injection type engine for a motorcycle according to claim 1, further comprising: an intake valve and an exhaust valve operable to be opened and closed; a valve actuating device with a camshaft; and a valve actuating chamber; wherein the intake valve and the exhaust valve are arranged in the cylinder head such that an operational axes thereof intersect in an approximately V-shape on a projection view to a plane (PL1) which includes the cylinder axis and an axis of an inlet portion of the intake port, wherein the valve actuating device which has an axis substantially perpendicular to an axis of the inlet portion of the intake port, and wherein the camshaft is arranged between the intake valve and the exhaust valve is housed in a valve actuating chamber which is formed between the cylinder head and the head cover jointed to the cylinder head. 4. The fuel injection type engine for a motorcycle according to claim 1, wherein the pair of left and right frame members overlap substantially all of the throttle body and the fuel injection valve when the motorcycle is viewed in side view. 5. The fuel injection type engine for a motorcycle according to claim 1, wherein upper parts of the throttle body are lower than a upper part of the cylinder head, thereby contributing to an enhanced saddling property and riding comfort. 6. The fuel injection type engine for a motorcycle according to claim 1, wherein a height (H1) of a top portion of the fuel injection valve and a height (H2) of a top portion of the cylinder head are substantially equal. 7. The fuel injection type engine for a motorcycle according to claim 1, wherein the fuel injection valve is arranged in a state that a top portion of the fuel injection valve projects above the pair of left and right main frames, and the top portion is disposed close to a back surface of a vehicle body cover. 8. The fuel injection type engine for a motorcycle according to claim 1, wherein the fuel injection valve is arranged such that an axis (L1) makes an acute angle with respect to the axis (L2) of the throttle body, and such that a top portion of the fuel injection valve extends above a portion of the throttle body. 9. The fuel injection type engine for a motorcycle according to claim 1, further comprising an ECU integrally mounted on an upper portion of the throttle body, the ECU being adapted to compute a fuel injection quantity of the fuel injection valve. 10. The fuel injection type engine for a motorcycle according to claim 1, wherein the rear cushion is disposed rearwardly of the engine, and the distance between portions of the left and right frame members adjacent to left and right sides to the engine is smaller than is larger the distance between portions of the left and right frame members adjacent to left and right sides of the rear cushion. 11. The fuel injection type engine for a motorcycle according to claim 1, wherein the insulator is bent, a forward end of the insulator connecting to the intake port, the axis (L3) of which is parallel to the lengthwise direction (LL) of the motorcycle, and a rear end of the insulator connecting to the throttle body, the axis (L2) of which extends in the direction at the angle to the lengthwise direction (LL) of the motorcycle. 12. The fuel injection type engine for a motorcycle according to claim 1, further comprising: a throttle valve capable of controlling a flow area of the intake passage of the throttle body such that the throttle valve is operable to be opened and closed. 13. The fuel injection type engine for a motorcycle according to claim 1, wherein the connecting sleeve portion of the cylinder head includes a mounting hole adapted to receive a distal end portion of the fuel injection valve such that the fuel injection valve is capable of injecting fuel towards the intake port, the fuel injection valve being hermetically fitted in to the mounting hole, wherein the engine is mounted on a vehicle body frame that includes the pair of left and right frame members, a rear cushion is interposed between a rear fork and the vehicle body frame, and wherein a distance between the pair of left and right frame members is enlarged from a front of the engine to the rear cushion. 14. The fuel injection type engine for a motorcycle according to claim 1, wherein a rear end of the throttle body is connected to an air cleaner at a position directly under the seat of the motorcycle. 15. A fuel injection type engine, comprising: a cylinder head having an intake port formed therein; a throttle body having an intake passage leading to the intake port in a body thereof; a throttle valve capable of controlling a flow area of the intake passage in the body such that the throttle valve is operable to be opened and closed; a fuel injection valve for injecting fuel toward the intake port; wherein a connecting sleeve portion projects further outwardly relative to a joint portion of the cylinder head and a head cover and forms an inlet portion of the intake port that is integrally formed with the cylinder head, and a distal end portion of the fuel injection valve is hermetically fitted into a mounting hole of the connecting sleeve portion, such that the fuel injection valve injects fuel towards the intake port, said mounting hole being formed in the connecting sleeve portion, and the throttle body is connected to the connecting sleeve portion with an insulator, and wherein the throttle body is arranged on an upper side of a transmission (M) of the engine, an axis of the inlet portion of the intake port which is integrally formed with the cylinder head is arranged on a plane (PL2) which is substantially orthogonal to a cylinder axis (C), and an axis of the intake passage of the throttle body is arranged on the plane (PL2), wherein the insulator is formed such that it is bent to one side in order to avoid interference between the throttle body and the rear cushion, and the insulator is arranged on the plane (PL2). 16. The fuel injection type engine according to claim 15, wherein an intake valve and an exhaust valve are operable to be opened and closed and are arranged in the cylinder head such that operational axes thereof intersect in an approximately V-shaped on a projection view to a plane (PL2) which includes the cylinder axis (C) and an axis of an inlet portion of the intake port, and a valve actuating device which has an axis substantially parallel to an axis of the inlet portion of the intake port and has a camshaft which is arranged between the intake valve and the exhaust valve is housed in a valve actuating chamber which is formed between the cylinder head and the head cover jointed to the cylinder head. 17. The fuel injection type engine according to claim 15, wherein the engine is mounted on a vehicle body frame, and a rear cushion is interposed between a rear fork and the vehicle body frame, and wherein the throttle body is arranged between the cylinder head and the rear cushion and the insulator is bent to avoid interfering with the rear cushion. 18. The fuel injection type engine according to claim 16, wherein the engine is mounted on a vehicle body frame, and a rear cushion is interposed between a rear fork and the vehicle body frame, and wherein the throttle body is arranged between the cylinder head and the rear cushion and the insulator is bent to avoid interfering with the rear cushion. 19. The fuel injection type engine according to claim 15, wherein a throttle drum which is arranged outwardly from the body and is integrally rotated with the throttle valve is arranged at a side opposite to the cylinder head. 20. The fuel injection type engine according to claim 16, wherein a throttle drum which is arranged outwardly from the body and is integrally rotated with the throttle valve is arranged at a side opposite to the cylinder head. 21. The fuel injection type engine according to claim 17, wherein a throttle drum which is arranged outwardly from the body and is integrally rotated with the throttle valve is arranged at a side opposite to the cylinder head. 22. The fuel injection type engine according to claim 18, wherein a throttle drum which is arranged outwardly from the body and is integrally rotated with the throttle valve is arranged at a side opposite to the cylinder head.