1963-1973 Mercruiser all Engines and Drives Service Manual Books 1 and 2, Page 335Get this manual
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ADJUSTMENTS for MODEL nBC" CARBURETOR INL ET FU EL ILTER
1093 Tigh ten cove sc rews
CHOKE ROD SETTING
a dj ustment is ce pt mak idle sc rew contac ts cam when choke valve is ly open