1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 26Get this manual
Boat WEIGHT DISTRIBUTIONTRIM TRIMMING OUTBOARD "OUT" ("UP")
Proper positioning of the weight inside the boat (persons and ge ar) has significant effect on the boat 's performance, for example:WARNING
Excessive trim "out" also may reduce the stability of some high speed hullsTo correct instability at high speed, reduce the power GRADUALLY and trim the outboard "in" slightly before resuming high speed operation(Rapid reduction in power will cause sudden change of steering torque and may cause additional momentary boat instability 1Will lift bow of boat, generally incre asing top spe ed2Transfers ste ering torque harder to left on single outboard installations below 23 in(584mm) transom height3Incre ases cle arance over submerged objects4In excess, can cause porpoising andor ventilation5If trimmed out beyond the water pickup, reduced water supply can cause overhe ating resulting in engine damageTRIMMING OUTBOARD "IN" ("DOWN")
Shifting weight to the re ar (stern) (1 enerally incre ases top spe ed(2 If in excess, can cause the boat to por-