1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 77Get this manual
Remove nozzle (awh ich secures ven turi (b) inside of carburet orRemove venturi (b)NOTE: It is NOT necessary to disassemble carbu retor beyond this point for cleaningExamine throttle shaft for wear and inspectfordamaged throttle shutter plateIf removal of throllie .maft and or throttle shuller plate i.s necessary, continue with next Step If necessaryre mo ve sc rews wh ich secure thro ttle shutter pla te to throttle shaft, then pull IhrOllle shaft oul of carbu re tor Remove sc rew (a), thrott le lever (b)throttle retu rn spring (c) and ylon spacer (d )
CARBURETOR CLEANING and INSPECTION
lPlace carburetor body, fu el bowl and metal part in car buretor cleaning solution for short period of lime to remove all dirt .gum and var nish which may have accumu lated