Carburator cleaning, inspection and repair
1972 Evinrude 125HP StarFlire outboards
GENERAL INSTRUCTIONS
Clean all parts, except float and float valve, in solvent and blow dry.
DO NOT dry parts with a cloth as lint may cause trouble in the reassembled carburetor. Be sure all particles of gaskets are removed from gasket surfaces. Flush all passages in the carburetor body with solvent and remove any gummy deposits with OMC Accessory Engine Cleaner. Certain solvents will not remove this gum which accumulates particularly in the float chamber and on needle valves.
FLOAT AND NEEDLE VALVE
a. Inspect float and arm for wear or damage. If the float is damaged, discard it and install a new one. Check float arm wear in the hinge pin and needle valve contact areas. Replace if necessary.
b. Inspect the inlet needle valve for grooves, nicks, or wear. If any are found, replace float valve assembly. See Figure 3-12. Gum or varnish on the needle valve must be removed with OMC Accessory Engine Cleaner. DO NOT attempt to alter the shape of the needle valves.
c. Check the needle valve seats with a magnifying glass; if seat is nicked, scratched, or worn out-of-round, it will not give satisfactory service. The valve seat and needle are a matched set; if either is worn, both parts must be replaced. Use a new gasket when reinstalling the needle seat.
Updated on: Monday, November 9, 2020