Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 49Get this manual
MAIN (HIGH SPEED) JET ADJUSTMENT The carburetor is equipped with fixed high speed jet (a) and normally no adjustment is required However, extreme changes in weather (temperature and humidity) andor elevation may result ina too lean or rich fuel mixture at wide-open-throttle, which may require change in the high speed jetA smaller size main jet will lean the fuel mixtureand larger size jet will enrichen the fuel mixture
HIGH ALTITUDE JET CHART
Engine Operating Elevation (Above Sea Level) Jet Install Jet With an Orifice
2500' -5000' (762-1524m) 5000'-7500' (1524-2286m) 7500' and Up (2286m and Up)
Main Main Main
.002" smaller (than standard jet) .004" smaller (than standard jet) .006" smaller (than stndard jet)
Standard High Speed Jet Chart Model
Model 9.9 and 210cc Sailpower Model Model 6
Jet Size
.056 .046 .046
JET ORIFICE SIZEPART NUMBER CHART