Carburetor Reassembly
1977 2HP Johnson/Evinrude outboards
General Instructions
Reassemble the carburetor, paying particular attention to the following procedure. Keep all dust, dirt, and lint out of the carburetor during reassembly. Be sure that parts are clean and free from gum and varnish when reassembling them. Replace all gaskets and sealing washers. DO NOT attempt to use original gaskets and washers, as leaks m develop after the engine is back in use.
Float and Chamber
a. Install and tighten the high-speed nozzle. Install a new float chamber boss gasket.
b. Replace float valve and gasket, float valve, and float and hinge pin in carburetor body.
c. To check position of float, turn carburetor body upside down, so that weight of the float closes float needle. Float should be parallel and flush with face of casting.
Float Level Adjustment
d. Using new gasket, install the float chamber to the carburetor body.
High- and Low-Speed Needle Valves
a. Install new packing washers in carburetor body. Install the packing nuts but do not tighten against the packing.
b. Install high- and low-speed needles, turning carefully until they are seated lightly. DO NOT turn down tight as the tapers on the needles may be damaged.
c. Back out the low-speed needle 1-1/2 turns.
d. Back out the high-speed needle 3/4 turn.
e. Tighten the packing nuts against the packing until the needles can just be turned with finger pressure. The needle valves will be adjusted after the carburetor has been installed on the motor.
Leaf Valves
a. The importance of keeping the leaves in these valves free from distortion cannot be over-emphasized. Replace any leaf or leaf back-up plate which shows an indication of distortion or damage.
b. The leaf is so designed that it maintains constant contact with the leaf plate until predetermined pressure is exerted against it. Leaf travel away from the plate is limited to 1/4" (6.35 mm) by the leaf back-up plate.
When pressure is removed, the inherent spring action of the leaf segments returns and holds them against the plate. Attach the leaf segments and leaf stops to the leaf plate, aligning leaves with marks on plate.
c. Apply OMC Screw Lock to leaf valve screw threads and tighten to torque specified in Section 2 to avoid distortion of the leaf plate.
NOTE
DO NOT lift or bend leaf segments by hand. This may damage them so that the leaves would have to be replaced.
d. Examine each leaf carefully. Each leaf must lie flat against the plate with no edges turned up or away from the plate.
Updated on: Monday, November 30, 2020