Yamaha 70 Owner's Manual

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  • Page 1 OWNER’S MANUAL U.S.A.Edition LIT-18626-06-95 6H3-28199-1T...
  • Page 2 EMU25060 ZMU01690 Read this owner’s manual carefully before operating your outboard motor.
  • Page 3: Important Manual Information

    EMU25110 tain maximum enjoyment from your new Yamaha. If you have any question about the operation or maintenance of your outboard motor, please consult a Yamaha dealer. In this Owner’s Manual particularly important OWNER’S MANUAL...
  • Page 4: Table Of Contents

    Table of contents General information ......1 Trim tab with anode......16 Trim rod (tilt pin) ......17 Identification numbers record..1 Tilt support lever for power trim and Outboard motor serial number ..1 tilt or hydro tilt model..... 17 Key number........
  • Page 5 YEAR LIMITED WARRANTY ..71 Cleaning and adjusting spark IMPORTANT WARRANTY plug ..........49 INFORMATION IF YOU USE Checking fuel system ...... 49 YOUR YAMAHA OUTSIDE THE Inspecting fuel filter ......50 USA OR CANADA ...... 74 Cleaning fuel filter ......50...
  • Page 6: General Information

    Record your outboard motor serial number in the spaces provided to assist you in ordering spare parts from your Yamaha dealer or for reference in case your outboard motor is sto- len. 1. Key number...
  • Page 7: Safety Information

    General information should give you an understanding of the motor and its operation. Before operating the boat, read any own- EMISSION CONTROL INFORMATION er’s or operator’s manuals supplied with it ENGINE FAMILY : THIS ENGINE CONFORMS TO 2001 U.S. EPA REGULATIONS FOR MARINE SI ENGINES. REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.
  • Page 8: Important Labels

    Never illegally discard (dump) the product. Attach the engine stop switch lanyard cord Yamaha recommends consulting the deal- to a secure place on your clothing, or your er on discarding the product. arm or leg while operating. If you acciden- Be informed about boating safety.
  • Page 9: Basic Boating Rules (Rules Of The Road)

    General information EMU25401 These rules determine which vessel has the Label right-of-way, and what each vessel should EWM01260 WARNING Stand-on vessel Be sure shift control is in neutral before The vessel with the right-of-way has the duty starting engine. (except 2HP) to continue its course and speed, except to Do not touch or remove electrical parts avoid an immediate collision.
  • Page 10: Other Special Situations

    General information sel head-on) Crossing When two power driven vessels are crossing Crossing: (you are traveling across the oth- each other’s path close enough to run the er vessel’s path) risk of collision, the vessel which has the oth- Overtaking: (you are passing or being er on the starboard (right) side must keep out passed by another vessel) of the way of the other.
  • Page 11 General information bend that may obstruct the view of other wa- er is going towards the port). This means that ter vessels, the operator should sound a pro- red buoys are passed on the starboard longed blast on the whistle (4 to 6 seconds). (right) side when proceeding from open wa- If another vessel is around the bend, it too ter into port, and black buoys are to port (left)
  • Page 12: Fueling Instructions

    General information ZMU01708 EMU25540 away from sparks, flames, or other Fueling instructions sources of ignition. EWM00010 Stop engine before refueling. WARNING Refuel in a well-ventilated area. Refuel GASOLINE AND ITS VAPORS ARE HIGH- portable fuel tanks off the boat. LY FLAMMABLE AND EXPLOSIVE! Take care not to spill gasoline.
  • Page 13: Gasoline

    The performance of your outboard motor will the fuel meets minimum octane ratings. be critically affected by your choice of propel- Yamaha does not recommended gasohol ler, as an incorrect choice could adversely containing methanol because it can cause affect performance and could also seriously fuel system damage or engine performance damage the motor.
  • Page 14: Start-In-Gear Protection

    53. on the engine. EMU25770 Start-in-gear protection Yamaha outboard motors are fitted with pro- Yamaha outboard motors or Yamaha-ap- pellers chosen to perform well over a range proved remote control units are equipped of applications, but there may be uses where with start-in-gear protection device(s).
  • Page 15: Basic Components

    Basic components EMU25797 Main components NOTE: * May not be exactly as shown; also may not be included as standard equipment on all mod- els. ZMU04945 1. Top cowling 15. Remote control box (side mount type)* 2. Top cowling lock lever 16.
  • Page 16: Fuel Joint

    Basic components tions. ZMU03157 1. Power trim and tilt switch 2. Remote control lever 1. Fuel joint 3. Neutral interlock trigger 2. Fuel gauge 4. Neutral throttle lever 3. Fuel tank cap 5. Main switch / choke switch 4. Air vent screw 6.
  • Page 17: Neutral Interlock Trigger

    Basic components 6. Throttle 7. Fully open EMU26201 Neutral interlock trigger To shift out of neutral, first pull the neutral in- terlock trigger up. 1. Fully open 2. Fully closed EMU25911 Tiller handle To change direction, move the tiller handle to the left or right as necessary.
  • Page 18: Throttle Grip

    Basic components 1. Throttle indicator 1. Forward “ ” 2. Neutral “ ” EMU25971 3. Reverse “ ” Throttle friction adjuster A friction device provides adjustable resis- EMU25941 tance to movement of the throttle grip or the Throttle grip remote control lever, and can be set accord- The throttle grip is on the tiller handle.
  • Page 19: Engine Stop Lanyard Switch

    Basic components NOTE: The engine cannot be started with the lock plate removed. When constant speed is desired, tighten the adjuster to maintain the desired throttle set- ting. EMU25990 Engine stop lanyard switch 1. Lanyard 2. Lock plate The lock plate must be attached to the en- gine stop switch for the engine to run.
  • Page 20: Main Switch

    Basic components EMU26090 EMU26141 Main switch Power trim and tilt switch on remote The main switch controls the ignition system; control or tiller handle its operation is described below. The power trim and tilt system adjusts the “ ” (off) outboard motor angle in relation to the tran- With the main switch in the “...
  • Page 21: Power Trim And Tilt Switch On Bottom Engine Cowling

    Basic components DOWN ZMU03096 EMU26151 NOTE: Power trim and tilt switch on bottom For instructions on using the power trim and engine cowling tilt switch, see page 38. The power trim and tilt switch is located on EMU26241 the side of the bottom engine cowling. Press- Trim tab with anode ing the switch “...
  • Page 22: Trim Rod (Tilt Pin)

    Basic components ZMU02528 ZMU03097 EMU26372 1. Trim tab Top cowling lock lever(s) (turn type) 2. Bolt To remove the engine top cowling, turn the lock lever(s) and lift off the cowling. When in- EMU26261 Trim rod (tilt pin) stalling the cowling, check to be sure it fits The position of the trim rod determines the properly in the rubber seal.
  • Page 23: Tachometer

    Basic components EMU26470 7. Engine trouble warning indicator Tachometer 8. Set button This gauge shows the engine speed and has 9. Mode button the following functions. NOTE: The water separator and engine trouble warning indicators only operate when the en- gine is equipped with the appropriate func- tions.
  • Page 24: Overheat Warning Indicator (Digital Type)

    Basic components rious engine damage will occur. ZMU04581 NOTE: ZMU01867 Memorize the trim angles that work best for 1. Oil level indicator your boat under different conditions. Adjust the trim angle to the desired setting with the EMU26581 Overheat warning indicator (digital power trim and tilt switch.
  • Page 25: Warning System

    Warning system ECM00090 CAUTION: Do not continue to operate the engine if a warning device has activated. Consult your Yamaha dealer if the problem can- not be located and corrected. EMU26816 Overheat warning This engine has an overheat warning device.
  • Page 26: Oil Level Warning And Oil Filter Clogging Warning

    Basic components ZMU03942 ZMU03026 The buzzer will sound (if equipped on the EMU26846 Oil level warning and oil filter tiller handle, remote control box, or main clogging warning switch panel). Oil injection models This engine has an oil level warning system. If the oil level falls below the lower limit, the warning system will activate.
  • Page 27 Basic components ZMU03828 1. Oil filter...
  • Page 28: Operation

    Operation EMU26901 specific boat and motor combination. Installation EWM00830 ECM00110 WARNING CAUTION: Improper mounting of the outboard mo- Incorrect engine height or obstructions tor could result in hazardous conditions to smooth water flow (such as the design such as poor handling, loss of control, or or condition of the boat, or accessories fire hazards.
  • Page 29: Clamping The Outboard Motor

    Other- mine the optimum mounting height. Con- wise the engine could be completely lost sult your Yamaha dealer boat if it accidentally falls off the transom. manufacturer for further information on de- termining the proper mounting height.
  • Page 30: Breaking In Engine

    Operation board (if packed). For details, consult EMU27060 Gasoline and engine oil mixing chart your Yamaha dealer. (50:1) EWM00650 WARNING 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.
  • Page 31: Preoperation Checks

    Check fuel line connections to be sure they are tight (if equipped Yamaha fuel tank or Watch for oil flowing through the oil feed boat tank). pipes. After any air in the oil lines has...
  • Page 32: Filling Fuel And Engine Oil

    Fuel tank capacity (if equipped Yamaha Ring Free Fuel Additive, available from fuel tank): your Yamaha dealer. Ring Free Fuel Addi- 25 L (6.60 US gal) (5.50 Imp.gal) tive has repeatedly proven its ability to clean combustion deposits from inside the engine, notably the critical piston-ring-land area, and fuel system components.
  • Page 33: Filling Oil For Electric Start Models

    EWM00530 WARNING Do not add gasoline into the oil tank. Fire or explosion could result. This engine uses the Yamaha oil injection system, which provides superior lubrication by ensuring the proper oil ratio for all operat- ZMU03370 ing conditions. No fuel premixing is needed.
  • Page 34: Oil Level Indicator Operation

    Operation EMU27321 Oil level indicator operation The various functions of the oil level system are as follows: EMU27360 Electric start models Oil level Oil level warning warning indicator indicator (analog Engine oil tank Remarks (digital tachometer/ tachometer) bottom cowling) Green more than 770 No refilling necessary.
  • Page 35: Starting Engine

    Operation tank cap, loosen it 2 or 3 turns. zontally, otherwise fuel cannot be drawn from the fuel tank. Squeeze the primer pump with the outlet end up until you feel it become firm. ZMU02295 If there is a fuel joint on the motor, firmly connect the fuel line to the joint.
  • Page 36 Operation gine stop switch. Turn the main switch to “ ” (start), and hold it for a maximum of 5 seconds. EWM00120 WARNING 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.
  • Page 37 Operation EMU27662 Electric start and remote control models Place the remote control lever in neutral. Turn the main switch to “ ” (on). Turn the main switch to “ ” (start), and hold it for a maximum of 5 seconds. NOTE: The start-in-gear protection device prevents the engine from starting except when in neu-...
  • Page 38: Warming Up Engine

    Place the throttle grip in the fully closed the lower case or the cooling water pilot position. hole is blocked. Consult your Yamaha dealer if the problem cannot be located and corrected. Move the gear shift lever quickly and...
  • Page 39: Reverse (Automatic Reverse Lock And Power Trim And Tilt Models)

    Operation firmly from neutral to forward. Move the gear shift lever quickly and firmly from neutral to reverse. Remote control models Pull up the neutral interlock trigger (if equipped) and move the remote control lever quickly and firmly from neutral to forward.
  • Page 40: Procedure

    Operation ping the engine immediately after operating at high speed is not recommended. EMU27844 Procedure Push and hold the engine stop button or turn the main switch to “ ” (off). ZMU03834 Tighten the air vent screw on the fuel tank cap (if equipped).
  • Page 41: Adjusting Trim Angle

    Operation the boat, sea conditions, and running speed. clamp bracket. Use caution when trying a trim position EWM00740 WARNING for the first time. Increase speed gradu- Excessive trim for the operating condi- ally and watch for any signs of instabil- tions (either trim up or trim down) can ity or control problems.
  • Page 42: Adjusting Boat Trim

    Operation 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”...
  • Page 43: Tilting Up And Down

    Operation motor trim angle may have little effect on the trim of the boat when operating. EMU27933 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...
  • Page 44 Operation ZMU02528 EWM00260 WARNING After tilting the outboard motor, be sure to support it with the tilt support knob or tilt support lever. Otherwise the outboard motor could fall back down suddenly if oil in the power trim and tilt unit loses pres- sure.
  • Page 45: Procedure For Tilting Down (Power Trim And Tilt Models / Power Tilt Models)

    Operation EMU28055 Procedure for tilting down (power trim and tilt models / power tilt models) Push the power trim and tilt switch / pow- er tilt switch “ ” (up) until the outboard motor is supported by the tilt rod and the tilt support lever / tilt support knob be- comes free.
  • Page 46: Cruising In Other Conditions

    For cooling system flushing instructions, see page 43. 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...
  • Page 47: Maintenance

    Power trim and tilt Performance: Propeller mark: Full throttle operating range: 5000–6000 r/min Fuel and oil: Maximum output: Recommended fuel: 51.5 kW@5500 r/min (70 HP@5500 Regular unleaded gasoline r/min) Min. pump octane: Idling speed (in neutral): 800 ±50 r/min Fuel tank capacity: Engine: 25 L (6.60 US gal) (5.50 Imp.gal)
  • Page 48: Transporting And Storing Outboard Motor

    Spark plug: sition using a motor support device such as 25.0 Nm (18.4 ft-lb) (2.55 kgf-m) a transom saver bar. Consult your Yamaha Propeller nut: dealer for further details. 35.0 Nm (25.8 ft-lb) (3.57 kgf-m)
  • Page 49: Procedure

    NOTE: mandatory to prevent excessive engine The use of “Yamaha Fuel Conditioner and damage due to rust. Perform the flush- Stabilizer” eliminates the need to drain the ing and fogging at the same time.
  • Page 50: Lubrication (Oil Injection Models)

    Batteries also generate explosive hydro- seal. Seal replacement should be per- gen gas; therefore, you should always formed by an authorized Yamaha dealer follow these preventive measures: prior to use. Charge batteries in a well-ventilated ar- Grease all grease fittings.
  • Page 51: Cleaning The Outboard Motor

    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 ZMU03223 endanger the operator and passengers.
  • Page 52: Maintenance Chart

    When operating in salt water, turbid or muddy water, the engine should be flushed with clean water after each use. The “ ” symbol indicates the check-ups which you may carry out yourself. The “ ” symbol indicates work to be carried out by your Yamaha dealer. Initial Every 50 hours Item...
  • Page 53: Greasing

    / throttle pick-up Inspection / adjustment timing Inspection / replace- Water pump ment Oil pump Inspection / adjustment Oil tank water drain Inspection / cleaning Cleaning / adjustment / Spark plug(s) replacement EMU28931 Greasing Yamaha marine grease (Water resistant grease) ZMU03125...
  • Page 54: Cleaning And Adjusting Spark Plug

    When fitting the plug, always clean the gas- Instead, take the outboard motor to a ket surface and use a new gasket. Wipe off Yamaha dealer. You should periodically re- any dirt from the threads and screw in the move and inspect the spark plug because spark plug to the correct torque.
  • Page 55: Inspecting Fuel Filter

    Check the fuel lines for leaks, crack, or mal- There will be fuel in the fuel filter. Keep function. If a problem is found, your Yamaha away from sparks, cigarettes, flames or dealer or other qualified mechanic should re- other sources of ignition.
  • Page 56: Inspecting Idling Speed

    A necessary. If any water is found in the flushing attachment or test tank can be fuel, the Yamaha portable fuel tank or used. other fuel tanks should be checked and A diagnostic tachometer should be used for cleaned.
  • Page 57: Checking Wiring And Connectors

    Maintenance EMU29153 Checking power trim and tilt system EWM00430 WARNING Never get under the lower unit while it is tilted, even when the tilt support lever is locked. Severe injury could occur if the outboard motor accidentally falls. Make sure no one is under the outboard ZMU03898 motor before performing this test.
  • Page 58: Checking Propeller

    Unlock the tilt sup- port lever. ZMU01896 Tilt the outboard motor down. Check that the tilt rod and trim rods operate smoothly. NOTE: Consult your Yamaha dealer if any operation is abnormal. ZMU01897 EMU29171 Checking propeller Checkpoints EWM00321...
  • Page 59: Removing The Propeller

    Maintenance tion, or other damage. Check the propeller shaft for damage. Check the splines / shear pin for wear or damage. Check for fish line tangled around the pro- peller shaft. 1. Cotter pin 2. Propeller nut 3. Washer 4. Spacer 5.
  • Page 60: Changing Gear Oil

    Apply Yamaha marine grease or a cor- Tilt the outboard motor so that the gear rosion resistant grease to the propeller oil drain screw is at the lowest point pos- shaft.
  • Page 61: Cleaning Fuel Tank

    Maintenance damage. Consult a Yamaha dealer for re- Yamaha dealer. pair of the lower unit seals. Keep away from sparks, cigarettes, flames, or other sources of ignition NOTE: when cleaning the fuel tank. For disposal of used oil, consult your Remove the fuel tank from the boat be- Yamaha dealer.
  • Page 62: Checking Battery (For Electric Start Models)

    EMU29320 Checking battery (for electric start external anodes periodically. Remove scales models) from the surfaces of the anodes. Consult a EWM00330 Yamaha dealer for replacement of external WARNING anodes. Battery electrolytic fluid is dangerous; it ECM00720 CAUTION: contains sulfuric acid and therefore is poisonous and highly caustic.
  • Page 63: Connecting The Battery

    NOTE: Consult a Yamaha dealer when charging or 1. Red cable re-charging batteries. 2. Black cable 3.
  • Page 64: Checking Top Cowling

    EMU29390 Checking top cowling Check the fitting of the top cowling by push- ing it with both hands. If it is loose have it re- paired by your Yamaha dealer. ZMU04678 EMU29400 Coating the boat bottom A clean hull improves boat performance. The boat bottom should be kept as clean of ma- rine growth as possible.
  • Page 65: Trouble Recovery

    Q. Has fuel pump malfunctioned? If your outboard motor requires repair, bring A. Have serviced by a Yamaha dealer. it to your Yamaha dealer. If the engine trouble warning indicator is Q. Are spark plug(s) fouled or of incorrect flashing, consult your Yamaha dealer.
  • Page 66 Q. Is fuel contaminated or stale? A. Fill tank with clean, fresh fuel. Q. Is carburetor clogged? A. Have serviced by a Yamaha dealer. Q. Is fuel filter clogged? A. Clean or replace filter. Q. Is fuel joint connection incorrect? A.
  • Page 67 Trouble Recovery A. Have serviced by a Yamaha dealer. Q. Are weeds or other foreign matter tangled on gear housing? Q. Is load on boat improperly distributed? A. Remove foreign matter and clean lower A. Distribute load to place boat on an even unit.
  • Page 68: Temporary Action In Emergency

    EWM00630 Q. Is steering pivot loose or damaged? WARNING A. Tighten or have serviced by a Yamaha Be sure to use the specified fuse. An in- dealer. correct fuse or a piece of wire could allow EMU29432 excessive current flow.
  • Page 69: Power Trim And Tilt / Power Tilt Will Not Operate

    When the emergency starter rope is used to start the engine, the start-in- NOTE: gear protection device does not oper- Consult your Yamaha dealer if the new fuse ate. Make sure the remote control lever immediately blows again. is in neutral. Otherwise the boat could...
  • Page 70: Emergency Starting Engine

    Trouble Recovery engine. Use the emergency starter rope only as instructed. Do not touch the fly- wheel or other moving parts when the engine is running. Do not install the starter mechanism or top cowling after the engine is running. Do not touch the ignition coil, spark plug wire, spark plug cap, or other elec- trical components when starting or op-...
  • Page 71: Engine Fails To Operate

    Trouble Recovery EMU29704 NOTE: Cold engine fails to start When the engine does not start with this pro- If the engine fails to start when it is cold, use cedure, see page 66. the following procedure. EMU29670 EWM00410 Engine fails to operate WARNING EMU29691 When starting or operating the engine, do...
  • Page 72 Trouble Recovery Turn the main switch to “ ” (start). ECM00191 CAUTION: Never turn the main switch to “ ” (start) while the engine is running. Do not keep the starter motor turning for more than 5 seconds. If the starter motor is turned continuously for more than 5 seconds, the battery will be ZMU03142...
  • Page 73: Treatment Of Submerged Motor

    Treatment of submerged motor emergency starter rope. If the outboard motor is submerged, immedi- ately take it to a Yamaha dealer. Otherwise some corrosion may begin almost immedi- ately. If you cannot immediately take the outboard...
  • Page 74: Consumer Information

    Consumer information EMU29811 Important warranty information for U.S.A. and Canada...
  • Page 75 Consumer information...
  • Page 76: Yamaha Motor Corporation, U.s.a. Outboard Motor Two Year Limited Warranty

  • Page 77 Consumer information...
  • Page 78 Consumer information...
  • Page 79: Important Warranty Information If You Use Your Yamaha Outside The Usa Or Canada

  • Page 82 Printed in Japan April 2006–0.3 × 1 ! Printed on recycled paper...

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