Mercury Mariner 4, 5 102CC Sail 1990 Outboard Service Shop Manual, Page 33Get this manual
B Turn low speed mixture sc rew (a) 1-1turn outward (cou nterc lockwise) from lightly seated posit ion 5Slowly turn low speed ixture sc rew lockwi se until
engine picks up speed and ires evenl y
6DO OT ad just leaner tha necessary for reasonably smooth idlin gIt is preferab le to set littl rich than too lean 7If engine hesita tes during accelerat ion after adjusting low speed mi xture, mixture is too lea nRichen low speed mixture slightly nl il eng ine accelerates smoothl y
Idle Adjustment
1Sla rt eng ne and allow it to wa up 10 normal operating temperatu re2Throttle engine back to idle os it ion and shi ft into