Patent ID: 6375525
Filing Date: 2002-04-23
Classification: F02B,F02D

Abstract:
An engine for a watercraft comprising a cylinder body, at least one cylinder bore being formed in said cylinder body, a piston being mounted for reciprocation within said cylinder bore, a cylinder head being disposed over a first end of said cylinder bore, a crankcase member being disposed over a second end of said cylinder bore, an output shaft being disposed at least partially within a crankcase chamber at least partially defined by said crankcase member, said output shaft powering an output device through a shiftable transmission, a transmission sensor being capable of detecting whether said output device is engaged or disengaged, a combustion chamber being defined at least partially within said cylinder bore between said cylinder head and said piston, an intake conduit communicating with said combustion chamber, a throttle valve being disposed within said intake conduit, a throttle valve sensor being capable of sensing a position of said throttle valve, a bypass passage communicating with said intake conduit at a location between said throttle valve and said combustion chamber, an idle speed control valve being disposed along said bypass passage, a controller electrically communicating with said idle speed control valve, said transmission sensor and said throttle valve sensor, said controller being adapted to close said idle speed control valve at a rate selected from a plurality of rates when said throttle valve is rapidly closed.