Patent ID: 7819391
Filing Date: 2010-10-26
Classification: F02B,F02D,F02M,Y10S

Abstract:
1. A carburettor for a two stroke engine comprising a flow duct comprising rich and lean flow passages separated by a partition, at least one fuel jet communicating with the rich passage, the partition including an aperture towards which the fuel jet is directed, and a substantially planar butterfly valve being received in the aperture so as to be pivotable between a first position, in which the flow duct is substantially closed and the aperture is substantially open, and a second position, in which the flow duct is substantially open and the aperture is substantially closed, the flow duct further comprising a venturi section located substantially upstream of the aperture, wherein the venturi section extends only partially around a part of a perimeter of the flow duct, wherein the substantially planar butterfly valve is disposed on a D-shaped spindle for pivotal movement thereon, and wherein the D-shaped spindle does not extend above a line projected along a lowermost surface of the substantially planar butterfly valve.