1976 Johnson 2HP 2R76 Outboard Motor Service Manual, Page 21Get this manual
bRemove five screws attaching carburetor body to float chambercRemove low-speed nut, then remove needle valveRemove packing from carburetor body and float chamber, using care to avoid damaging threads in carburetor bodydRemove hinge pin, float, and float valve, and unscrew valve seat and gasketeRemove high-speed nozzle and boss gasketSee Figure 3-"5
CLEANING, INSPECTION AND REPAIR
GENERAL INSTRUCTIONS Clean all parts, except cork float, in solvent and blow dryDO NOT dry parts with cloth as lint may cause trouble in the reassembled carburetorBe sure all particles of gaskets are removed from gasket surfacesFlush out passages in the carburetor body and float chamber with solvent and remove any gummy deposits with OMC Accessory Engine CleanerCertain solvents will not remove this gum which accumulates particularly in the float chamber and on the needle valvesFLOAT AND NEEDLE VALVE aInspect float and arm for wear or damageIf the float has become oil-soaked, discard it and install new oneCheck float arm wear in the hing pin and needle valve contact areas, and replace if necessarybInspect hinge pin for wear, which may result from excessive vibrationReplace if necessarycInspect the float needle valve for grooves, nicks, or scratches; if any are found replace float valve assemblySee Figure 3-6Gum or varnish on the needle valve may be removed with OMC Accessory Engine CleanerDO NOT attempt to alter the shape of the needle valve or seatdCheck the needle valve seat with nicked, scratched, or worn out-of-round, serviceThe valve seat and needle are worn, both parts must be replacedUse installing the needle seatSee Figure 3-7NEEDLE VALVES aRemove all gum or varnish depoSits with OMC Accessory Engine CleanerbInspect the tapered ends of the high- and low-speed needle valves for grooves, nicks, or scratches; replace if necessarySee Figure 3-8magnifying glass; if seat is it will not give satisfactory matched set; if either is new sealing gasket when re-