Engine mount structure

An engine mount structure to support an engine on a vehicle frame structure for a motorcycle, in which:

• the vehicle frame structure includes a main frame extending rearwardly and slantwise downwardly from a head pipe;
• the engine includes a crankcase to support a crankshaft and a cylinder block connected above the crankcase, the engine being supported on the main frame at three locations including a front portion, a rear upper portion and a rear lower potion thereof;
• and
• the main frame includes a pair of left and right first frame pieces both extending from upwardly of the engine in a direction rearwardly of the engine, a pair of left and right second frame pieces each extending from a front portion the associated first frame piece in a direction slantwise downwardly, and a pair of left and right third frame pieces each extending in a rearward direction from a lower end of the corresponding second frame piece through laterally of the cylinder block and connected with an intermediate portion of the associated first frame piece,
• the mount structure comprising:
• a first mount section to support a front portion of the engine, the first mount section being constituted by a rubber mount which includes a pair of left and right support portions provided at a joint between the second frame piece and the third frame piece and left and right to-be-supported portions each provided in the engine, the respective support portion being connected with the associated to-be-supported portion through an elastic member;
• and
• a connecting member configured to connect the left and right support portions with each other.