Patent ID: 7104527

Claim:
A carburetor comprising a manual choke mechanism comprising a return spring adapted to open a fixed choke valve, a pressing device adapted to fix said choke valve, a valve closing spring adapted to close a throttle valve, and a choke valve lever secured to a choke valve shaft and a throttle valve lever secured to a throttle valve shaft: wherein said return spring and said pressing device are structured, such that said return spring overcomes a fixing force of said pressing device so as to open said choke valve from a position proximate to a fully open position to the fully open position, and said pressing device overcomes a spring force of said return spring so as to fix the choke valve at another position, and wherein said choke valve lever and the throttle valve lever are structured, such that said throttle valve is set to a position slightly open from an idle position when said choke valve is fully closed, said throttle valve is set to the idle position due to the spring force of said valve closing spring when said choke valve is opened from a fully closed position, said choke valve is opened from a half-open state proximate to the fully open position when said throttle valve is opened from the idle position to the fully open position, and the opening and closing of said throttle valve occurs without mutual interference when said choke valve is fully opened.