Two-cycle combustion engine

A combustion engine which comprises:

• a crankcase for operatively supporting a crankshaft and including first and second crank casings that are split in a direction conforming to an axis of the crankshaft;
• and
• a cylinder block connected with an upper portion of the crankcase by means of a fastening bolt fitted in a direction upwardly from a crankcase-side,
• the cylinder block being formed with a threaded hole, the crankcase being formed with a mating insertion hole, which is aligned with the threaded hole in the cylinder block when the latter is mounted atop the crankcase and the fastening bolt, extending through the mating insertion hole and being threaded into the threaded hole to connect the cylinder block and the crankcase together,
• wherein the first crank casing is formed with a recess, defining a bolt access passage through which the fastening bolt is fastened to or removed from the cylinder block.

A combustion engine which comprises:

• a crankcase for operatively supporting a crankshaft and including first and second crank casings that are split in a direction conforming to an axis of the crankshaft;
• and
• a cylinder block connected with an upper portion of the crankcase by means of a fastening member;
• wherein the fastening member is fitted in a direction upwardly from a crankcase-side and the cylinder block has an air intake passage defined therein for introducing air from one side of the cylinder block to a scavenging passage formed in the cylinder block, the air intake passage being positioned above the fastening member and open at the one side of the cylinder block.