Abstract: An engine lubrication system including an oil passage allowing inflow of oil in a crank chamber partitioned off in a crankcase of an engine, at least a part of the oil passage being formed by the crankcase, a scavenge pump accommodated in the crankcase and sucking the oil from the oil passage, an oil tank accumulating the oil sucked by the scavenge pump, and a feed pump supplying, to the engine, the oil accumulated in the oil tank.

Abstract: A vehicle includes, an engine including a crankshaft, a crankcase which is configured to accommodate the crankshaft therein, and a centrifugal clutch which is arranged coaxially with the crankshaft, and a propeller shaft to which rotational power output from the engine and changed in speed is transmitted, the propeller shaft passing through the crankcase and intersecting the crankshaft in plan view, at least a part of the propeller shaft being located between the centrifugal clutch and a support wall portion of the crankcase configured to support the crankshaft and above a lower end of the centrifugal clutch.

Abstract: A vehicle includes, an engine including a crankshaft, a crankcase which is configured to accommodate the crankshaft therein, and a centrifugal clutch which is arranged coaxially with the crankshaft, and a propeller shaft to which rotational power output from the engine and changed in speed is transmitted, the propeller shaft passing through the crankcase and intersecting the crankshaft in plan view, at least a part of the propeller shaft being located between the centrifugal clutch and a support wall portion of the crankcase configured to support the crankshaft and above a lower end of the centrifugal clutch.

Abstract: An engine lubrication system including an oil passage allowing inflow of oil in a crank chamber partitioned off in a crankcase of an engine, at least a part of the oil passage being formed by the crankcase, a scavenge pump accommodated in the crankcase and sucking the oil from the oil passage, an oil tank accumulating the oil sucked by the scavenge pump, and a feed pump supplying, to the engine, the oil accumulated in the oil tank.

Abstract: An air cleaner includes an air cleaner case, a first filter element, a lid, at least one first engagement portion, and at least one second engagement portion. The air cleaner case includes an opening. The first filter element is preferably tubular and detachably disposed inside the air cleaner case. The lid is disposed on an extension line of an axis of the first filter element to cover the opening. The lid includes a rotatable handle. The first engagement portion rotates with rotation of the handle. The second engagement portion engages with the first engagement portion. When the first engagement portion is rotated along a first direction and engaged with the second engagement portion, the lid is fixed to the air cleaner case. When the first engagement portion is rotated along a second direction and disengaged from the second engagement portion, the lid is detached from the air cleaner case.

Abstract: An air cleaner includes an air cleaner case, a first filter element, a lid, at least one first engagement portion, and at least one second engagement portion. The air cleaner case includes an opening. The first filter element is preferably tubular and detachably disposed inside the air cleaner case. The lid is disposed on an extension line of an axis of the first filter element to cover the opening. The lid includes a rotatable handle. The first engagement portion rotates with rotation of the handle. The second engagement portion engages with the first engagement portion. When the first engagement portion is rotated along a first direction and engaged with the second engagement portion, the lid is fixed to the air cleaner case. When the first engagement portion is rotated along a second direction and disengaged from the second engagement portion, the lid is detached from the air cleaner case.