Abstract: An engine case includes: a crank chamber (2R) of an engine (1); a clutch chamber (30R) having a wet clutch (30) connected to an output shaft (2) protruding from the crank chamber (2R); a partition wall (10) keeping the crank and clutch chambers separated and connecting the crank and clutch chambers; an oil inlet (11) for introducing engine oil; an oil feeding passage (11R) which is configured to allow the engine oil introduced from the oil inlet (11) to first enter the clutch chamber (30R) separated by the partition wall (10); and an inflow part (10h) which is formed in the partition wall (10) and configured to allow an excess amount of the introduced engine oil over a predetermined amount to flow into the crank chamber (2R).

Abstract: An engine case includes: a crank chamber (2R) of an engine (1); a clutch chamber (30R) having a wet clutch (30) connected to an output shaft (2) protruding from the crank chamber (2R); a partition wall (10) keeping the crank and clutch chambers separated and connecting the crank and clutch chambers; an oil inlet (11) for introducing engine oil; an oil feeding passage (11R) which is configured to allow the engine oil introduced from the oil inlet (11) to first enter the clutch chamber (30R) separated by the partition wall (10); and an inflow part (10h) which is formed in the partition wall (10) and configured to allow an excess amount of the introduced engine oil over a predetermined amount to flow into the crank chamber (2R).

Abstract: In an in-cylinder fuel injection two cycle engine, a combustion chamber dome and a piston cavity are provided in an offset position from a cylinder bore center axis to an exhaust port side, respectively. A spark plug is mounted in a cylinder head such that its electrode is positioned in vicinity of the cylinder bore center axis in the dome. Further, a fuel injector is mounted in the cylinder head such that its injection nozzle is positioned around an outer periphery edge of the dome on the exhaust port side and fuel is injected from the injection nozzle toward the piston cavity. The piston cavity is shaped into a concavely spherical surface so as to direct injected fuel toward the electrode of the spark plug, thereby locally rich, combustible mixture being formed around the spark plug.