PURPOSE: To provide a fuel supply device to a two-cycle engine whereby a supply amount of fuel to a combustion chamber can be quickly increased when desired to accelerate engine speed.
CONSTITUTION: Fuel is supplied by a carburetor 9 to an intake passage in an intake pipe 20, to produce a mixture, and it is circulated successively by the order of an intake port 21, crank chamber 48, scavenger port 50 and a combustion chamber 46 of a 2-cycle engine 8, to make this mixture perform combustion in the combustion chamber 46. On the other hand, separately from the carburetor 9, an accelerating pump 60 is provided, to additionally supply fuel, when desired accelerating an engine speed, to the scavenger port 50 provided just before the combustion chamber 46.
MORIYA YOSHIHIKO