Patent ID: 7201622
Filing Date: 2007-04-10
Classification: B63B,B63H

Abstract:
1. An internal combustion engine for a personal watercraft, wherein the personal watercraft comprises a vessel body including a hull and a deck, the deck being capable of supporting at least one rider thereon, wherein the internal combustion engine is mounted in the body between the hull and the deck, the engine comprising: wherein the crankcase and the cylinder block each have a plurality of ribs formed on the interior surfaces thereof, the ribs of the crankcase and the cylinder block forming mutually opposed rib pairs, the mutually opposed rib pairs being spaced apart in a longitudinal direction of the engine, wherein the first balance shaft is arranged parallel to the crankshaft, each of the balance shaft and the crankshaft being disposed proximate the dividing plane; wherein one of said crankshaft bearings is situated on each of the rib pairs; wherein the balance shaft bearing fits on a selected mutually opposed rib pair; and the balance shaft bearing is closer to an adjacent mutually opposed rib pair as compared with the crankshaft bearing of the selected mutually opposed rib pair.