Consult your Yamaha dealer if the problem cannot be located and corrected. EMU Overheat warning twin engines This engine has an overheat warning device. Page 40 Check the oil level and add oil as needed. If the oil level is correct and the warning device does not switch off, consult your Yamaha dealer. Page Operation EMU Installation ECM CAUTION: Incorrect engine height or obstructions to smooth water flow such as the design or condition of the boat, or accessories such as transom ladders or depth finder trans- ducers can create airborne water spray while the boat is cruising.
Severe engine damage may result if the motor is operat- ed continuously in the presence of air- borne water spray. Page Breaking In Engine Test runs at different heights can help determine the optimum mounting height. Consult your Yamaha dealer or boat manufacturer for further information on determining the prop- er mounting height.
For instructions on setting the trim angle of the outboard motor, see page Page Preoperation Checks Make sure there are no fuel leaks or gaso- line fumes. Check fuel line connections to be sure they are tight if equipped Yamaha fuel tank or boat tank. Be sure the fuel tank is positioned on a se- cure, flat surface, and that the fuel line is not Page Filling Fuel Performance drops and engine wear increases dramatical- While many additives available may reduce deposits, Yamaha recommends the use of Ring Free Fuel Additive, available from your Yamaha dealer.
Ring Free Fuel Additive has repeatedly proven its ability to clean com Page Starting Engine 1. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg. Page Warming Up Engine Otherwise serious engine dam- age could occur. Check the oil level and add oil if necessary. Consult your Yamaha dealer if the cause for the low oil pressure warning indicator cannot be found.
Page Shifting Stop the engine and check whether the cooling water inlet on the lower case or the cooling water pilot hole is blocked. If the cooling passage is frozen, it may take awhile for water to start flowing out of the pilot hole. After the engine is at idle speed in gear move the remote control lever firmly and crisply into the neutral position.
Page Trimming Outboard Motor After stopping the engine, disconnect the fuel line or close the fuel cock if there is a fuel joint or a fuel cock on the boat. Tighten the air vent screw on the fuel tank cap if equipped. Remove the key if the boat will be left un- attended.
Page Adjusting Boat Trim Operation complete stop with the engine off. Do not adjust the trim angle with this switch while the boat is moving. Adjust the outboard motor trim angle using the power trim and tilt switch. Power trim and tilt switch 1.
Operat- ing with excessive trim-in at higher speeds also makes the boat unstable. Page 52 Operation Disconnect the fuel line from the out- board motor or close the fuel cock.
ZMU Push the tilt support knob into the clamp bracket or pull the tilt support lever toward you to support the engine. This protects the rods from marine growth and corrosion which could damage the power trim and tilt mechanism.
Return the outboard motor to its normal position as soon as the boat is back in deeper water. Page 55 Operation Cruising in turbid water Yamaha strongly recommends that you use the optional chromium-plated water pump kit not available for some models if you use the outboard motor in turbid or muddy water con- ditions.
EMU Dimension: Overall length: mm However, you, the owner, with a min- imum of tools, can perform the following pro- cedures. Consult your Yamaha dealer or other qualified mechanic if the fuel system is to be drained instead. There- fore the following procedures may not always apply. Procedure Disconnect and remove the battery from the boat. Always disconnect the black negative cable first to prevent the risk of shorting. Page Cleaning The Outboard Motor If you or the owner is not famil- iar with machine servicing, this work should be done by your Yamaha dealer or other qualified mechanic.
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any marine engine repair establishment or individual. Page Maintenance Chart When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. A damaged insulator could allow external sparks, which could lead to explosion or Page Checking Fuel System Do not attempt to di- agnose any problems yourself. Instead, take the outboard motor to a Yamaha dealer.
You should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode.
The oil is hot and should be handled with care to avoid burns. Page 67 Continued op- eration with a problem could cause severe engine damage. Turn off the engine and wait 3 minutes. Page 68 Dispose of used oil according to local regulations. Change the oil more often when operating the engine under adverse conditions such as extended trolling. Draining the oil by removing the oil drain Page Checking Propeller Activate the trim-up switch until the tilt rod is fully extended.
Unlock the tilt support lever. Tilt the outboard motor down. Page Removing The Propeller Be sure to use a new cotter pin and bend the ends over securely. Otherwise the propeller could come off during opera- tion and be lost.
Apply Yamaha marine grease or a corro- sion resistant grease to the propeller shaft. Install the thrust washer and propeller on the propeller shaft. Page Changing Gear Oil If the oil is milky, water is getting into the gear case which can cause gear damage. Consult a Yamaha dealer for re- pair of the lower unit seals. NOTE: Inspect ground leads attached to external an- odes on equipped models. Consult a Yamaha dealer for inspection and replacement of inter- nal anodes attached to the power unit.
Page Connecting The Battery If the battery will be stored for longer than a month, check the specific gravity of the fluid at least once a month and recharge the battery when it is low. Page Disconnecting The Battery 5. Large black lead 6. Negative connecting cable 7. The boat bottom should be kept as clean of marine growth as possible. If necessary, the boat bot- tom can be coated with an anti-fouling paint approved for your area to inhibit marine growth.
Page Trouble Recovery A. Check for cause of electric overload and repair. Replace fuse with one of correct am- perage. Are starter components faulty? Have serviced by a Yamaha dealer. Is shift lever in gear? Shift to neutral. Engine will not start starter operates.
Page 78 Q. Is fuel filter clogged? Clean or replace filter. Have ignition parts failed? Has warning system activated? Find and correct cause of warning. Is spark plug gap incorrect? Page 79 A. Distribute load to place boat on an even plane. Is water pump or thermostat faulty? Is there excess water in fuel filter cup? Drain filter cup. Engine power loss. Remove and clean propeller. Is motor mounting bolt loose? Tighten bolt. Is steering pivot loose or damaged? Tighten or have serviced by a Yamaha dealer.
Page Replacing Fuse EMU Replacing fuse If the fuse has blown on an electric start mod- el, open the fuse box and use a fuse puller to replace the fuse with a spare one of the prop- er amperage. An in- correct fuse or a piece of wire could allow excessive current flow.
Otherwise some corrosion may begin almost immediate- If you cannot immediately take the outboard motor to a Yamaha dealer, follow the proce- dure below in order to minimize engine dam- age. Take the outboard motor to a Yamaha dealer as soon as possible. Page 86 Consumer information Page 88 Consumer information This manual is also suitable for: F Lf Lf Newsletter Sign Up. Posted in : Air Law Show details. Savings: We offer low rates and plenty of discounts.
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