Yamaha 8 Cm Owners Manual
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Operation 26 EMU27872 Adjusting trim angle for manual tilt models There are 4 or 5 holes provided in the clamp bracket to adjust the outboard motor trim an- gle. 1. Stop the engine. 2. Tilt the outboard motor up, and then re- move the trim rod from the clamp brack- et.3. Reposition the rod in the desired hole. To raise the bow (“trim-out”), move the rod away from the transom. To lower the bow (“trim-in”), move the rod to- ward the transom. Make test runs with the trim set to different angles to find the position that works best for your boat and operating conditions. WARNING EWM00400 Stop the engine before adjusting the trim angle. Use care to avoid being pinched when removing or installing the rod. Use caution when trying a trim position for the first time. Increase speed gradu- ally and watch for any signs of instabil- ity or control problems. Improper trim angle can cause loss of control. NOTE: The outboard motor trim angle can be changed approximately 4 degrees by shifting the trim rod one hole. EMU27911 Adjusting boat trim When the boat is on plane, a bow-up attitude results in less drag, greater stability and effi- ciency. This is generally when the keel line of 1. Trim operating angle ZMU02858 1 1. Trim rod ZMU02859 1
Operation 27 the boat is up about 3 to 5 degrees. With the bow up, the boat may have a greater tenden- cy to steer to one side or the other. Compen- sate for this as you steer. The trim tab can also be adjusted to help offset this effect. When the bow of the boat is down, it is easier to accelerate from a standing start onto plane. Bow Up Too much trim-out puts the bow of the boat too high in the water. Performance and econ- omy are decreased because the hull of the boat is pushing the water and there is more air drag. Excessive trim-out can also cause the propeller to ventilate, which reduces per- formance further, and the boat may “por- poise” (hop in the water), which could throw the operator and passengers overboard. Bow Down Too 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 speeds also makes the boat unstable. Resistance at the bow is greatly increased, heightening the danger of “bow steering” and making opera- tion difficult and dangerous. NOTE: Depending on the type of boat, the outboard motor trim angle may have little effect on the trim of the boat when operating. EMU27921 Tilting up and down If the engine will be stopped for some time or if the boat is moored in shallows, the out- board motor should be tilted up to protect the propeller and casing from damage by colli- sion with obstructions, and also to reduce salt corrosion. WARNING EWM00220 Be sure all people are clear of the out- board motor when tilting up and down, also be careful not to pinch any body parts between the drive unit and engine bracket. WARNING EWM00230 Leaking fuel is a fire hazard. Tighten the air vent screw and place the fuel cock in the closed position if the outboard motor
Operation 28 will be tilted for more than a few minutes. Otherwise fuel may leak. CAUTION: ECM00231 Before tilting the outboard motor, fol- low the procedure under “Stopping en- gine” in this chapter. Never tilt the outboard motor while the engine is run- ning. Severe damage from overheating can result. Do not tilt up the engine by pushing the tiller handle because this could break the handle. Keep the power unit higher than the propeller at all times. Otherwise water could run into the cylinder and cause damage. The outboard motor cannot be tilted when in reverse or when the outboard motor is turned 180° (facing the rear). EMU27978 Procedure for tilting up (manual tilt models) 1. Place the gear shift lever in neutral. 2. Disconnect the fuel line from the out- board motor.3. Place the tilt lock lever (if equipped) in the release/up position. 4. Pull up the shallow water lever (if equipped). 5. Hold the rear of the top cowling with one hand and tilt the engine up fully. 6. Push the tilt support knob into the clamp bracket. Or the tilt support bar will turn to the lock position automatically. ZMU02854 ZMU02887
Operation 29 EMU28013 Procedure for tilting down (manual tilt models) 1. Slightly tilt the engine up. 2. On models equipped with a tilt support knob, pull it out. 3. Slowly tilt the engine down. EMU28060 Cruising in shallow water The outboard motor can be tilted up partially to allow operation in shallow water. EMU28071 Cruising in shallow water (manual tilt models) WARNING EWM00710 Place the gear shift in neutral before us- ing the shallow water cruising system. Run the boat at the lowest possible speed when using the shallow water cruising system. The tilt lock mecha- nism does not work while the shallow water cruising system is being used. Hitting an underwater obstacle could cause the outboard motor to lift out of the water, resulting in loss of control. Do not rotate the outboard motor 180° and operate the boat in reverse. Place the gear shift in reverse to operate the boat in reverse. Use extra care when operating in re-verse. Too much reverse thrust can cause the outboard motor to lift out of the water, increasing the chance of ac- cident and personal injury. Return the outboard motor to its normal position as soon as the boat is back in deeper water. CAUTION: ECM00260 Do not tilt the outboard motor up so that the cooling water inlet on the lower unit is above the surface of the water when set- ting up for and cruising in shallow water. Otherwise severe damage from overheat- ing can result. EMU28110 Procedure 1. Place the gear shift lever in neutral. 2. Slightly tilt the outboard motor up. Pull up the shallow water lever. ZMU02888 ZMU02868
Operation 30 3. The shallow water lever will lock, sup- porting the outboard motor in a partially raised position. 4. When lowering the outboard motor, slightly tilt it up and push the shallow wa- ter lever down. Slowly lower the out- board motor to the normal position. EMU28192 Cruising in other conditions Cruising in salt water After operating in salt water, flush the cooling water passages with fresh water to prevent them from becoming clogged with salt de- posits. NOTE: For cooling system flushing instructions, see page 32. 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 conditions. ZMU02854
31 Maintenance EMU31480 Specifications NOTE: “(AL)” stated in the specification data below represents the numerical value for the alumi- num propeller installed. Likewise, “(SUS)” represents the value for stainless steel propeller installed and “(PL)” for plastic propeller installed. EMU28218 Dimension: Overall length: 802 mm (31.6 in) Overall width: 343 mm (13.5 in) Overall height S: 977 mm (38.5 in) Transom height S: 436 mm (17.2 in) Weight (AL) S: 27.0 kg (60 lb) Performance: Full throttle operating range: 4500–5500 r/min Maximum output: 5.9 kW@5000 r/min (8 HP@5000 r/ min) Idling speed (in neutral): 900 ± 50 r/min Engine: Type: 2-stroke L Displacement: 165.0 cm 3 (10.07 cu.in) Bore × stroke: 50.0 × 42.0 mm (1.97 × 1.65 in) Ignition system: CDI Spark plug with resistor (NGK): BR7HS-10Spark plug gap: 0.9–1.0 mm (0.035–0.039 in) Control system: Tiller Starting system: Manual Starting carburetion system: Choke valve Alternator output: 80 W Drive unit: Gear positions: Forward-neutral-reverse Gear ratio: 2.08 (27/13) Trim and tilt system: Manual tilt Propeller mark: N Fuel and oil: Recommended fuel: Regular unleaded gasoline Min. pump octane: 86 Fuel tank capacity: 12 L (3.17 US gal) (2.64 Imp.gal) Recommended engine oil: YAMALUBE 2-stroke outboard motor oil Lubrication: Pre-mixed fuel and oil Recommended gear oil: Hypoid gear oil SAE#90 Gear oil quantity: 160.0 cm 3 (5.41 US oz) (5.64 Imp.oz) Tightening torque for engine: Spark plug: 25.0 Nm (18.4 ft-lb) (2.55 kgf-m) Propeller nut: 17.0 Nm (12.5 ft-lb) (1.73 kgf-m)
Maintenance 32 EMU28222 Transporting and storing outboard motor WARNING EWM00690 Leaking fuel is a fire hazard. When transporting and storing the outboard motor, close the air vent screw and fuel cock to prevent fuel from leaking. USE CARE when transporting fuel tank, whether in a boat or car. DO NOT fill fuel container to maximum capacity. Gasoline will expand consid- erably as it warms up and can build up pressure in the fuel container. This can cause fuel leakage and a potential fire hazard. WARNING EWM00700 Never get under the lower unit while it is tilted, even if a motor support bar is used. Severe injury could occur if the outboard motor accidentally falls. CAUTION: ECM00660 Do not use the tilt support lever or knob when trailering the boat. The outboard motor could shake loose from the tilt sup- port and fall. If the motor cannot be trail- ered in the normal running position, use an additional support device to secure it in the tilt position. The outboard motor should be trailered and stored in the normal running position. If there is insufficient road clearance in this position, then trailer the outboard motor in the tilt po- sition using a motor support device such as a transom saver bar. Consult your Yamaha dealer for further details. EMU28235 Clamp screw mounting models When transporting or storing the outboard motor while removed from a boat, keep the outboard motor in the attitude shown. NOTE: Place a towel or something similar under the outboard motor to protect it from damage. EMU30272 Storing outboard motor When storing your Yamaha outboard motor for prolonged periods of time (2 months or longer), several important procedures must be performed to prevent excessive damage. It is advisable to have your outboard motor serviced by an authorized Yamaha dealer prior to storage. However, you, the owner, with a minimum of tools, can perform the fol- ZMU02870 ZMU02869
Maintenance 33 lowing procedures. CAUTION: ECM01411 Do not place the outboard motor on its side before the cooling water has drained from it completely, otherwise water may enter the cylinder through the exhaust port and cause engine trou- ble. Store the outboard motor in a dry, well- ventilated place, not in direct sunlight. EMU28302 Procedure EMU28372 Flushing in a test tank 1. Wash the outboard motor body using fresh water. For further information, see page 34. 2. Fill the fuel tank with fresh fuel and add one ounce of “Yamaha Fuel Conditioner and Stabilizer” (Part No. LUB-FUELC- 12-00) to each gallon of fuel. NOTE: The use of “Yamaha Fuel Conditioner and Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or other qualified mechanic if the fuel system is to be drained instead. 3. Remove the engine top cowling and si- lencer cover. 4. Install the outboard motor on the test tank.5. Fill the tank with fresh water to above the level of the anti-cavitation plate. CAUTION: ECM00300 Do not run the engine without supplying it with cooling water. Either the engine water pump will be damaged or the en- gine will be damaged from overheating. Before starting the engine, be sure to supply water to the cooling water passag- es. CAUTION: ECM00290 If the fresh water level is below the level of the anti-cavitation plate, or if the water supply is insufficient, engine seizure may occur. 6. Cooling system flushing is essential to prevent the cooling system from clog- ging up with salt, sand, or dirt. In addi- tion, fogging of the engine is mandatory to prevent excessive engine damage due to rust. Perform the flushing and fogging at the same time. WARNING EWM00090 Do not touch or remove electrical parts 1. Water surface 2. Lowest water level ZMU02051 1 2
Maintenance 34 when starting or during operation. Keep hands, hair, and clothes away from the flywheel and other rotating parts while the engine is running. 7. Run the engine at a fast idle for 10–15 minutes in neutral position. 8. Just prior to turning off the engine, quick- ly spray “Yamaha Stor-Rite Engine Fogging Oil” (Part No. LUB-STRRT-12- 00) alternately into each carburetor or the fogging hole of the silencer cover, if equipped. When properly done, the en- gine will smoke excessively and almost stall. 9. Remove the outboard motor from the test tank. 10. Drain the cooling water completely out of the motor. Clean the body thoroughly. 11. Install the silencer cover/cap and top cowling. EMU28400 Lubrication (except oil injection models) 1. Grease the spark plug threads and in- stall the spark plug(s) and torque to proper specification. For information on spark plug installation, see page 37. 2. Change the gear oil. For instructions, see page 41. Inspect the oil for the pres- ence of water that indicates a leaky seal. Seal replacement should be performed by an authorized Yamaha dealer prior to use. 3. Grease all grease fittings. For further de- tails, see page 37. EMU28421 Cleaning and anticorrosion measures 1. Wash down the exterior of the outboard motor with fresh water and dry off com- pletely.2. Spray the outboard motor exterior with “Yamaha Silicone Protectant” (Part No. LUB-SILCNE-13-00). 3. Wax the cowling with a non-abrasive wax such as “Yamaha Silicone Wax” (Part No. ACC-11000-15-02). EMU28450 Cleaning the outboard motor After use, wash the exterior of the outboard motor with fresh water. Flush the cooling system with fresh water. NOTE: For cooling system flushing instructions, see page 32. EMU28460 Checking painted surface of motor Check the motor for scratches, nicks, or flak- ing paint. Areas with damaged paint are more likely to corrode. If necessary, clean and paint the areas. A touch-up paint is avail- able from your Yamaha dealer. EMU28486 Periodic maintenance WARNING EWM01070 Be sure to turn off the engine when you perform maintenance unless otherwise specified. 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 35 Maintenance, replacement, or repair of the emission control devices and sys- tems may be performed by any marine engine repair establishment or individual. All warranty repairs, however, including those to the emission control system, must be performed by an authorized Yamaha marine dealership. A service manual is available for purchase through your Yamaha dealer for owners who have the mechanical skills, tools, and other equipment necessary to perform mainte- nance not covered by this owner’s manual. EMU28510 Replacement parts If replacement parts are necessary, use only genuine Yamaha parts or parts of the same type and of equivalent strength and materi- als. Any part of inferior quality may malfunc- tion, and the resulting loss of control could endanger the operator and passengers. Yamaha genuine parts and accessories are available from your Yamaha dealer.