Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 34Get this manual
Float Adjustment , Remove car buretor as ou tlined inCarburetor
Removal ," fo lo wing
Main (High Speed) Jet Adjustment
The carburetor is equipped with fixed high speed je (a) and norma ll no adjustment is required owever, extreme changes in weather (tempe rature and humidity) and orelevation may result in too lean or rich uel mixtu re at wide-open -throttle, which may require change in the hig speed jetA smaller size main jet witl lean the fuel mixture, and larger size jet wi ll enrichen the fuel mixture
2Remove float bowl and check ftoat level
1 In(1 3mm)
3If necessary adjust float level by bending float tang
Standard High Speed Jet Chart
Model 4Sa il power Jet NoJet Size 0.03 in (0.78mm) 0.032 in(O.80mm)