Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 94Get this manual
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7 Reinstall attenuator cover with locknuts and flat washers as shownTighten locknuts to 60 lbin(6.8 Nm) aAir Ball CoverFuel Connector
Synchronizing Carburetors
Refer to "TimingSynch ronizi