Watercraft Having a Four Stroke Engine with a Supercharger

A personal watercraft comprising:

• a hull;
• a deck disposed on the hull;
• an engine compartment defined between the hull and the deck;
• a four stroke internal combustion engine disposed in the engine compartment, the engine comprising:
• a crankcase having a top, a bottom, two sides, and two ends, the crankcase being separable along a plane defining an upper crankcase and a lower crankcase, the plane being disposed at an angle from horizontal when viewed from one of the ends of the crankcase;
• a crankshaft rotatably mounted in the crankcase between the two ends;
• a balance shaft rotatably mounted in the crankcase between the two ends parallel to the crankshaft,
• the crankshaft and the balance shaft being disposed in the plane such that the balance shaft is vertically higher on the crankcase than the crankshaft;
• a cylinder head housing operatively connected to the top of the crankcase,
• the crankcase and the cylinder head housing forming at least one combustion chamber therebetween;
• at least one intake valve for the at least one combustion chamber;
• at least one exhaust valve for the at least one combustion chamber;
• a valve actuation assembly located in the cylinder head housing for actuating the at least one intake valve and the at least one exhaust valve;
• and
• at least one air intake passageway fluidly connected to the at least one combustion chamber;
• a propulsion unit operatively coupled to the crankshaft;
• and
• at least one air intake manifold fluidly connected to the at least one air intake passageway.