External drive double shaft overhead cam engine

An overhead cam engine, comprising:

• a crankcase having a first side and an opposite second side;
• a crankshaft and a timing shaft rotatably disposed in said crankcase, said timing shaft parallel to said crankshaft and extending substantially completely across said crankcase, said timing shaft directly rotatably coupled to said crankshaft at a location in said second side and extending out said first side;
• a piston and connecting rod assembly driving said crankshaft;
• a cylinder head having a camshaft rotatably disposed therein, said camshaft actuating valves in said cylinder head;
• an endless loop drivingly connecting a pair of drive members, one said drive member mounted on an end of said timing shaft which extends externally of said first side of said crankcase, and the other said drive member mounted on an end of said camshaft which extends externally of said cylinder head.

An overhead cam engine, comprising:

• a crankcase having a first side and an opposite second side;
• a crankshaft rotatably disposed in said crankcase along a substantially vertical axis, said crankshaft having a drive gear mounted thereon, said drive gear disposed in said second side of said crankcase;
• a timing shaft parallel to said crankshaft, said timing shaft rotatably disposed in a first bearing in said first side of said crankcase and in a second bearing in said second side of said crankcase, said timing shaft having a timing gear mounted thereon, said timing gear disposed in said second side of said crankcase and driven by said drive gear at half the speed of said crankshaft;
• a cylinder block having a cylinder bore therein disposed along a substantially horizontal axis, said cylinder bore receiving a piston therein, said piston drivingly connected to said crankshaft;
• a cylinder head with a camshaft rotatably disposed therein, said camshaft actuating a pair of valves in said cylinder head;
• a timing pulley mounted on an end of said timing shaft extending externally out of said first side of said crankcase;
• a camshaft pulley mounted on an end of said camshaft extending externally of said cylinder head;
• and
• a timing belt connecting said timing pulley and said camshaft pulley.