Yamaha 8 Cm Owners Manual
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16 Operation EMU26901 Installation CAUTION: ECM00110 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 transducers) can create airborne water spray while the boat is cruising. Severe engine damage may result if the motor is operated continuously in the presence of airborne water spray. NOTE: During water testing check the buoyancy of the boat, at rest, with its maximum load. Check that the static water level on the ex- haust housing is low enough to prevent wa- ter entry into the powerhead, when water rises due to waves when the outboard is not running. EMU26910 Mounting the outboard motor WARNING EWM00820 Overpowering a boat could cause se- vere instability. Do not install an out- board motor with more horsepower than the maximum rating on the capac- ity plate of the boat. If the boat does not have a capacity plate, consult the boat manufacturer. The information presented in this sec- tion is intended as reference only. It is not possible to provide complete in- structions for every possible boat and motor combination. Proper mounting depends in part on experience and the specific boat and motor combination. WARNING EWM00830 Improper mounting of the outboard mo- tor could result in hazardous conditions such as poor handling, loss of control, or fire hazards. Observe the following: For permanently mounted models, your dealer or other person experienced in proper rigging should mount the motor. If you are mounting the motor yourself, you should be trained by an experi- enced person. For portable models, your dealer or oth- er person experienced in proper out- board motor mounting should show you how to mount your motor. Mount the outboard motor on the center line (keel line) of the boat, and ensure that the boat itself is well balanced. Otherwise the boat will be hard to steer. For boats without a keel or which are asymmetrical, consult your dealer. EMU26920 Mounting height To run your boat at optimum efficiency, the water resistance (drag) of the boat and out- board motor must be made as little as possi- ble. The mounting height of the outboard 1. Center line (keel line) ZMU017601
Operation 17 motor greatly affects the water resistance. If the mounting height is too high, cavitation tends to occur, thus reducing the propulsion; and if the propeller tips cut the air, the engine speed will rise abnormally and cause the en- gine to overheat. If the mounting height is too low, the water resistance will increase and thereby reduce engine efficiency. Mount the outboard motor so that the anti-cavitation plate is between the bottom of the boat and a level 25 mm (1 in.) below it. NOTE: The optimum mounting height of the out- board motor is affected by the boat and motor 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 of the outboard motor, see page 25. EMU26970 Clamping the outboard motor 1. Place the outboard motor on the tran- som so that it is positioned as close to the center as possible. Tighten the tran- som clamp screws evenly and securely. Occasionally check the clamp screws for tightness during operation of the out- board motor because they could be-come loose due to engine vibration. WARNING EWM00640 Loose clamp screws could allow the out- board motor to fall off or move on the transom. This could cause loss of control and serious injury. Make sure the tran- som screws are tightened securely. Oc- casionally check the screws for tightness during operation. 2. If the engine restraint cable attachment is equipped on your engine, an engine restraint cable or chain should be used. Attach one end to the engine restraint cable attachment and the other to a se- cure mounting point on the boat. Other- wise the engine could be completely lost if it accidentally falls off the transom. 3. Secure the clamp bracket to the transom using the bolts provided with the out- ZMU02011 0–25mm (0–1in.)ZMU02012 ZMU02013
Operation 18 board (if packed). For details, consult your Yamaha dealer. WARNING EWM00650 Avoid using bolts, nuts or washers other than those contained in the engine pack- aging. If used, they must be of at least the same quality of material and strength and must be tightened securely. After tighten- ing, test run the engine and check their tightness. EMU30173 Breaking in engine Your new engine requires a period of break- in to allow mating surfaces of moving parts to wear in evenly. Correct break-in will help en- sure proper performance and longer engine life. CAUTION: ECM00800 Failure to follow the break-in procedure could result in reduced engine life or even severe engine damage. EMU27050 Gasoline and engine oil mixing chart (25:1) CAUTION: ECM00150 Be sure to mix gasoline and oil complete- ly, otherwise the engine may be dam- aged. EMU27074 Procedure for pre-mixed models Run the engine under load (in gear with a propeller installed) for 10 hours as follows. 1. First 10 minutes: Run the engine at the lowest possible speed. A fast idle in neutral is best. 2. Next 50 minutes: Do not exceed half throttle (approxi- mately 3000 r/min). Vary engine speed occasionally. If you have an easy-plan- ing boat, accelerate at full throttle onto plane, then immediately reduce the throttle to 3000 r/min or less. 3. Next two hours: Accelerate at full throttle onto plane, then reduce engine speed to three-quar- ter throttle (approximately 4000 r/min). Vary engine speed occasionally. Run at full throttle for one minute, then allow about 10 minutes of operation at three- quarter throttle or less to let the engine 1. Bolts ZMU02637 1 1. : Gasoline 2. : Engine oil
Operation 19 cool. 4. Remaining seven hours: Run the engine at any speed. However, avoid operating at full throttle for more than 5 minutes at a time. 5. After the first 10 hours: Operate the engine normally. Use the standard premix ratio of gasoline and oil. For details on mixing fuel and oil, see page 19. EMU27102 Preoperation checks WARNING EWM00080 If any item in the preoperation check is not working properly, have it inspected and repaired before operating the out- board motor. Otherwise an accident could occur. CAUTION: ECM00120 Do not start the engine out of water. Over- heating and serious engine damage can occur. EMU27111 Fuel Check to be sure you have plenty of fuel for your trip. 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 twisted or flattened, or likely to contact sharp objects (if equipped Yamaha fuel tank or boat tank). EMU27120 Oil Check to be sure you have plenty of oil foryour trip. EMU27130 Controls Check throttle, shift, and steering for prop- er operation before starting the engine. The controls should work smoothly, with- out binding or unusual free play. Look for loose or damaged connections. Check operation of the starter and stop switches when the outboard motor is in the water. EMU27140 Engine Check the engine and engine mounting. Look for loose or damaged fasteners. Check the propeller for damage. EMU27233 Filling fuel and engine oil EMU27242 Filling fuel for portable tank WARNING EWM00060 Gasoline and its vapors are highly flam- mable and explosive. Keep away from sparks, cigarettes, flames, or other sources of ignition. 1. Remove the fuel tank cap. 2. Fill the fuel tank carefully. 3. Close the cap securely after refueling. Wipe up any spilled fuel. EMU27404 Gasoline and oil mixing (100:1) If equipped with a portable fuel tank Fuel tank capacity (if equipped Yamaha fuel tank): 12 L (3.17 US gal) (2.64 Imp.gal) Gasoline to engine oil ratio Break-in period See page 18 After break-in 100:1
Operation 20 1. Pour oil into the portable fuel tank, and then add gasoline. 2. Replace the fuel tank cap and close tightly. 3. Shake the fuel tank to mix the fuel thor- oughly. 4. Make sure that the oil and gasoline are mixed. If equipped with a built-in fuel tank 1. Pour oil into a clean fuel can, and then add gasoline. 2. Replace the fuel can cap and close tight- ly. 3. Shake the fuel can to mix the fuel thor- oughly. 4. Make sure that the oil and gasoline are mixed. 5. Pour the gasoline and oil mixture into thebuilt-in fuel tank. CAUTION: ECM00810 Avoid using any oil other than the spec- ified type. Use a thoroughly blended fuel-oil mix- ture. If the mixture is not thoroughly mixed, or if the mixing ratio is incorrect, the following problems could occur. Low oil ratio: Lack of oil could cause major engine trouble, such as piston seizure. High oil ratio: Too much oil could cause fouled spark plugs, smoky exhaust, and heavy carbon deposits. NOTE: If using a permanently installed tank, pour the oil gradually as the gasoline is being add- ed to the tank. EMU27450 Operating engine EMU27461 Feeding fuel (portable tank) WARNING EWM00420 Before starting the engine, make sure that the boat is tightly moored and that you can steer clear of any obstructions. Be sure there are no swimmers in the water near you. When the air vent screw is loosened, gasoline vapor will be released. Gaso- line is highly flammable, and its vapors are flammable and explosive. Refrain from smoking, and keep away from open flames and sparks while loosen- ing the air vent screw. This product emits exhaust gases which contain carbon monoxide, a col- orless, odorless gas which could cause 1. Engine oil 2. Gasoline
Operation 21 brain damage or death when inhaled. Symptoms include nausea, dizziness, and drowsiness. Keep cockpit and cab- in areas well ventilated. Avoid blocking exhaust outlets. 1. If there is an air vent screw on the fuel tank cap, loosen it 2 or 3 turns. 2. If there is a fuel joint on the motor, firmly connect the fuel line to the joint. Then firmly connect the other end of the fuel line to the joint on the fuel tank.3. If a steering friction adjuster is provided on your outboard motor, securely attach the fuel line to the fuel line clamp. NOTE: During engine operation place the tank hori- zontally, otherwise fuel cannot be drawn from the fuel tank. 4. Squeeze the primer pump with the outlet end up until you feel it become firm. EMU27490 Starting engine EMU27505 Manual start models (tiller control) 1. Place the gear shift lever in neutral. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu- tral. 2. Attach the engine stop switch lanyard to a secure place on your clothing, or your ZMU02024 ZMU02025
Operation 22 arm or leg. Then install the lock plate on the other end of the lanyard into the en- gine stop switch. WARNING EWM00120 Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg while operating. Do not attach the lanyard to clothing that could tear loose. Do not route the lanyard where it could become entan- gled, preventing it from functioning. Avoid accidentally pulling the lanyard during normal operation. Loss of en- gine power means the loss of most steering control. Also, without engine power, the boat could slow rapidly. This could cause people and objects in the boat to be thrown forward. 3. Place the throttle grip in the “” (start) position.4. Pull out / turn the choke knob fully. After the engine starts, replace / return the knob to the home position. NOTE: It is not necessary to use the choke when starting a warm engine. If the choke knob is left in the “” (start) position while the engine is running, the engine will run poorly or stall. 5. Pull the manual starter handle slowly un- til you feel resistance. Then give a strong pull straight out to crank and start the engine. Repeat if necessary. 6. After the engine starts, slowly return the manual starter handle to its original po- sition before releasing it. 7. Slowly return the throttle grip to the fully closed position. ZMU02860
Operation 23 NOTE: When the engine is cold, it needs to be warmed up. For further information, see page 23. If the engine does not start on the first try, repeat the procedure. If the engine fails to start after 4 or 5 tries, open the throttle a small amount (between 1/8 and 1/4) and try again. Also if the engine is warm and fails to start, open the throttle a same amount and try to start the engine again. If the engine still fails to start, see page 45. EMU27670 Warming up engine EMU27681 Choke start models 1. After starting the engine, allow it to idle for 3 minutes to warm up. Failure to do so will shorten engine life. Gradually re- turn the choke knob to its home position as the engine warms up. 2. Check for a steady flow of water from the cooling water pilot hole. CAUTION: ECM00511 A continuous flow of water from the cool- ing water pilot hole shows that the water pump is pumping water through the cool- ing passages. If water is not flowing out of the hole at all times while the engine is running, overheating and serious dam-age could occur. Stop the engine and check whether the cooling water inlet on the lower case or the cooling water pilot hole is blocked. Consult your Yamaha dealer if the problem cannot be located and corrected. EMU27740 Shifting WARNING EWM00180 Before shifting, make sure there are no swimmers or obstacles in the water near you. CAUTION: ECM00220 To change the boat direction or shifting position from forward to reverse or vice- versa, first close the throttle so that the engine idles (or runs at low speeds). EMU27764 Forward (tiller handle and remote control models) Tiller handle models 1. Place the throttle grip in the fully closed position. ZMU02030 ZMU02856
Operation 24 2. Move the gear shift lever quickly and firmly from neutral to forward. Remote control models 1. Pull up the neutral interlock trigger (if equipped) and move the remote control lever quickly and firmly from neutral to forward. EMU27796 Reverse (manual tilt and hydro tilt models) WARNING EWM00190 When operating in reverse, go slowly. Do not open the throttle more than half. Oth- erwise the boat could become unstable, which could result in loss of control and an accident. Tiller handle models 1. Place the throttle grip in the fully closed position.2. On models equipped with a tilt lock le- ver, check that it is in the lock/down po- sition. 3. Move the gear shift lever quickly and firmly from neutral to reverse. Remote control models 1. Check that the tilt lock lever is in the lock position. 2. Pull up the neutral interlock trigger (if equipped) and move the remote control lever quickly and firmly from neutral to reverse. EMU27820 Stopping engine Before stopping the engine, first let it cool off for a few minutes at idle or low speed. Stop- ping the engine immediately after operating at high speed is not recommended. EMU27832 Procedure 1. Push and hold the engine stop button ZMU02030 N F ZMU02866 ZMU02030 ZMU02867 RN
Operation 25 until the engine comes to a complete stop. 2. After stopping the engine, tighten the air vent screw on the fuel tank cap and set the fuel cock lever or knob to the closed position, if equipped. 3. Disconnect the fuel line if you are using an external fuel tank. NOTE: If the outboard motor is equipped with an en- gine stop switch lanyard, the engine can alsobe stopped by pulling the lanyard and remov- ing the lock plate from the engine stop switch. EMU27861 Trimming outboard motor The trim angle of the outboard motor helps determine the position of the bow of the boat in the water. Correct trim angle will help im- prove performance and fuel economy while reducing strain on the engine. Correct trim angle depends upon the combination of boat, engine, and propeller. Correct trim is also affected by variables such as the load in the boat, sea conditions, and running speed. WARNING EWM00740 Excessive trim for the operating condi- tions (either trim up or trim down) can cause boat instability and can make steering the boat more difficult. This in- creases the possibility of an accident. If the boat begins to feel unstable or is hard to steer, slow down and/or readjust the trim angle.