1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 367Get this manual
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DISASSEMBL Y ';01': Only rear carburetor is equipp ed with choke, ko ever, repair pro ce dure is identical for bOlh carburetorscrew from throttl sha ft(ig ure 3) ret !nlng screw nd ck washers and sepa