OHV and gear mechanism for engine

An OHV engine including, cams provided on a camshaft interlocked with and connected to a crankshaft and stored in a crankcase and a plurality of rocker arms pivotably supported by cylinder heads being interlocked and connected with each other via a connecting rod,

• wherein the connecting rod is stored in part in a pipe member disposed between said crankcase and the cylinder heads at a position away from an outer wall of cylinder blocks and one end of the pipe member is connected to a first communication chamber formed from the cylinder heads to upper portion of cylinder blocks, and an opposite end of the pipe member is connected to a second communication chamber formed in the crankcase that is formed integrally with said cylinder blocks,
• wherein the cylinder blocks each have a plurality of cylinder bores connected to the crankcase with cylinder axes (CL, CR) of said cylinder bores being displaced in a direction along an axis of the crankshaft,
• the connecting rod being a plurality of connecting rods for transmitting power from the cams,
• wherein a part of the plurality of connecting rods are individually interlocked with and connected to the plurality of rocker arms pivotably supported, respectively, by the cylinder heads connected respectively to the cylinder blocks, and are stored in a rod storage chamber provided, respectively, in the cylinder heads, the cylinder blocks and the crankcase between the cylinder axes (CL, CR) of the adjacent cylinder bores in said respective cylinder blocks;
• and
• wherein a remaining one of the plurality of connecting rods disposed outwardly of the cylinder axes (CL, CR) of outermost cylinder bores is laid along the axis of said crankshaft and is stored in part in the pipe member disposed at a position away from the outer wall of said cylinder blocks.