Our 1939 gas tank caps contain a needle valve with a coil spring to hold it in position. In some cases, this spring may be a little too strong, causing a pressure to build up in the tank and the carburetor to flood, also interfering with the flow of gasoline in the carburetor because of no vent in the cap.
You may find it necessary to hook out a coil of this spring thru the two holes in the bottom of the cap. Cutting off a coil to a coil and a half will allow the needle valve to seat very lightly or a short distance away from the gas cap vent hole, allowing a free flow of gas and eliminating the tank pressure. This condition has been interfering with high speed
performance on motors.
INDIAN MOTOCYCLE COMPANY
SERVICE DEPARTMENT
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