Fuel supply for internal combustion engines

摘要

Internal combustion engine including a fuel supply system which comprises a main carburetor having an intake passage leading to a combustion chamber of the engine. The engine is further provided with a starting fuel supply device which includes a starting fuel supply passage having one end opening to atmosphere and the other end connected with the intake passage. The starting fuel supply passage is provided with a fuel discharge nozzle and a starter valve disposed downstream of the nozzle. The supply passage has a cross-sectional area which is small in relation to that of the intake passage so that adequate air flow speed can be ensured even in engine starting period.