Installation28NOTICEECM01631 Check that the idle hole stays highenough to keep out water getting insideengine even if the boat is in stationarywith maximum load. Incorrect engine height or obstructionsto the smooth flow of water (such as thedesign or condition of the boat, or ac-cessories such as transom ladders ordepth finder transducers) can createairborne water spray while the boat iscruising. If the motor is operated con-tinuously in the presence of airbornewater spray, enough water could enterthe engine through the intake openingon the cowling to cause severe enginedamage. Eliminate the cause of the air-borne water spray.TIP: The optimum mounting height of the out-board motor is affected by the boat andmotor combination and the desired use.Test runs at different heights can help de-termine the optimum mounting height.Consult your Yamaha dealer or boat man-ufacturer for further information on deter-mining the proper mounting height. For instructions on setting the trim angle ofthe outboard motor, see page 46.EMU26972Clamping the outboard motor1. Place the outboard motor on the tran-som so that it is positioned as close tothe center as possible. Tighten the tran-som clamp screws evenly and securely.Occasionally check the clamp screwsfor tightness during operation of the out-board motor because they could be-come loose due to engine vibration.WARNING! Loose clamp screwscould allow the outboard motor to falloff or move on the transom. Thiscould cause loss of control and seri-ous injury. Make sure the transomscrews are tightened securely. Occa-sionally check the screws for tight-ness during operation. [EWM00641]2. If the restraint cable attachment isequipped on your engine, a restraint ca-ble or chain should be used. Attach oneend to the restraint cable attachmentand the other to a secure mounting pointon the boat. Otherwise the engine couldbe completely lost if it accidentally fallsoff the transom.ZMU020110–25mm(0–1in)ZMU02012