PURPOSE: To improve acceleration at low temperature time by preventing air-fuel ratio from its leanness in the acceleration initial period at the low temperature time, in the case of a carburetor of two-barrel type.
CONSTITUTION: A subvalve 31 for decreasing a flow path section of an intake passage in a side of a primary barrel 11 in the acceleration initial period at low temperature time is provided in the downstream of a throttle valve 26 in the primary barrel 11, and a flow path area correcting means 41 for decreasing a flow path section of the intake passage in a side of a secondary barrel 21 in the acceleration initial period at the low temperature time is provided, to promote vaporization of fuel in both the primary and secondary barrels 11, 21.
NOGAMI SUSUMU
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