Yamaha 90a Owner's Manual

Also see for 60F: Service manual Owner's manual Owner's manual Owner's manual Owner's manual

Contents

Yamaha 90a Owner's Manual Manual pdf 52 page image

Operation46Bow UpToo much trim-out puts the bow of the boattoo high in the water. Performance and econ-omy are decreased because the hull of theboat is pushing the water and there is moreair drag. Excessive trim-out can also causethe propeller to ventilate, which reduces per-formance further, and the boat may “por-poise” (hop in the water), which could throwthe operator and passengers overboard.Bow DownToo much trim-in causes the boat to “plow”through the water, decreasing fuel economyand making it hard to increase speed. Oper-ating with excessive trim-in at higher speedsalso makes the boat unstable. Resistance atthe bow is greatly increased, heightening thedanger of “bow steering” and making opera-tion difficult and dangerous.TIP:Depending on the type of boat, the outboardmotor trim angle may have little effect on thetrim of the boat when operating.EMU27935Tilting up and downIf the engine will be stopped for some time orif the boat is moored in shallows, the out-board motor should be tilted up to protect thepropeller and lower casing from damage bycollision with obstructions, and also to re-duce salt corrosion.WARNINGEWM00222Make sure that no one is near the out-board motor when tilting the outboardmotor up or down. Otherwise, body partscould be crushed between the outboardmotor and the clamp bracket.WARNINGEWM00250Leaking fuel is a fire hazard. If there is afuel joint on the outboard motor, discon-nect the fuel line or close the fuel cock ifthe engine will be tilted for more than afew minutes. Otherwise fuel may leak.NOTICEECM00241● Before tilting the outboard motor, stopthe engine by following the procedureon page 43. Never tilt the outboard mo-tor while the engine is running. Severedamage from overheating can result.● Do not tilt up the engine by pushing thetiller handle (if equipped) because thiscould break the handle.EMU32724Procedure for tilting up (power trimand tilt models)1. Place the remote control lever / gearshift lever in neutral.