Yamaha 25 Owner's Manual
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Yamaha 25 Owner's Manual

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25
OWNER'S MANUAL
U.S.A.Edition
LIT-18626-06-93
6L2-28199-1R

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Summary of Contents for Yamaha 25

  • Page 1 OWNER’S MANUAL U.S.A.Edition LIT-18626-06-93 6L2-28199-1R...
  • Page 2 EMU25060 ZMU01690 Read this owner’s manual carefully before operating your outboard motor.

  • Page 3: Important Manual Information

    EMU25110 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 information is distinguished in the following OWNER’S MANUAL...

  • Page 4: Table Of Contents

    Gasoline and oil mixing (100:1)..24 Air vent screw ......... 12 Operating engine ......25 Remote control........ 12 Feeding fuel (portable tank) .... 25 Remote control lever ....... 12 Starting engine ........ 26 Neutral interlock trigger ....13 Warming up engine....... 33 Neutral throttle lever......
  • Page 5 Battery care........46 IMPORTANT WARRANTY Cleaning the outboard motor ..46 INFORMATION IF YOU USE Checking painted surface of YOUR YAMAHA OUTSIDE THE motor..........46 USA OR CANADA ...... 71 Periodic maintenance....47 Replacement parts ......47 Maintenance chart ......48 Greasing .........

  • 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 Several sets of rules prevail according to geographic location, but are all basically the same as the International Rules of the Road. The rules presented here in your Owner’s Manual are condensed, and have been pro- vided for your convenience only. Consult your local U.S.

  • Page 10: Rules When Encountering Vessels

    General information “In obeying and construing these rules due Meeting If you are meeting another power vessel regard shall be had to all dangers of naviga- head on, and are close enough to run the risk tion and collision, and to any special circum- of collision, neither of you has the right-of- stances, which may render a departure from way! Both of you should alter course to avoid...

  • Page 11: Other Special Situations

    General information Overtaking the power-driven vessel, the power-driv- If you are passing another vessel, you are en vessel has the right-of-way. the “Give-Way” vessel. This means that the Sailing vessels should keep clear of any other vessel is expected to maintain its fishing vessel.

  • 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

    25ER 52 minutes if ethanol content does not exceed 10% and the fuel meets minimum octane ratings. EMU25730 Yamaha does not recommended gasohol Without a rectifier or Rectifier containing methanol because it can cause Regulator fuel system damage or engine performance ECM01090 problems.

  • Page 14: Propeller Selection

    18 volts or higher with the above models. Consult your 1. Propeller diameter in inches 2. Propeller pitch in inches Yamaha dealer for details on installing an 3. Type of propeller (propeller mark) optional Rectifier Regulator. EMU25742...

  • Page 15: Start-In-Gear Protection

    General information EMU25770 Start-in-gear protection Yamaha outboard motors or Yamaha-ap- proved remote control units are equipped with start-in-gear protection device(s). This feature permits the engine to be started only when it is in neutral. Always select neutral before starting the engine.

  • Page 16: 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. ZMU04829 1. Manual starter handle* 15. Anti-cavitation plate 2. Choke knob 16. Clamp bracket 3. Warning indicator 17.

  • Page 17: Fuel Joint

    Basic components fuel tank, its function is as follows. EMU26180 Remote control EWM00020 The remote control lever actuates both the WARNING shifter and the throttle. The electrical switch- The fuel tank supplied with this engine is es are mounted on the remote control box. its dedicated fuel reservoir and must not be used as a fuel storage container.

  • Page 18: Neutral Interlock Trigger

    Basic components 2. Forward “ ” 3. Reverse “ ” 4. Shift 5. Fully closed 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.

  • Page 19: Gear Shift Lever

    Basic components ZMU02846 ZMU02848 EMU25961 EMU25922 Throttle indicator Gear shift lever The fuel consumption curve on the throttle Pulling the gear shift lever towards you puts indicator shows the relative amount of fuel the engine in forward gear so that the boat consumed for each throttle position.

  • Page 20: Engine Stop Lanyard Switch

    Basic components there is too much resistance, it could be power, the boat could slow rapidly. This difficult to move the remote control lever could cause people and objects in the or throttle grip, which could result in an boat to be thrown forward. accident.

  • Page 21: Choke Knob For Pull Type

    Basic components EMU26080 Starter button To start the engine with the electric starter, push the starter button. ZMU03690 EMU26011 Choke knob for pull type To supply the engine with the rich fuel mix- ZMU04856 ture required to start, pull out this knob. EMU26090 Main switch The main switch controls the ignition system;...

  • Page 22: Steering Friction Adjuster

    Basic components EMU26122 If the boat tends to veer the left (port side), Steering friction adjuster turn the trim tab rear end to the port side “A” A friction device provides adjustable resis- in the figure. If the boat tends to veer the right tance to the steering mechanism, and can be (starboard side), turn the trim tab end to the set according to operator preference.

  • Page 23: Shallow Water Lever

    Basic components EMU26270 Shallow water lever Lifting this lever will tilt the motor up partially to provide more clearance when operating in shallow water. ZMU03699 EMU26372 Top cowling lock lever(s) (turn type) To remove the engine top cowling, turn the lock lever(s) and lift off the cowling.

  • Page 24: 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. If the engine temperature rises too high, the warning device will activate.

  • Page 25: 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 26: Clamping The Outboard Motor

    Mount the casionally check the screws for tightness outboard motor so that the anti-cavitation during operation. plate is between the bottom of the boat and a level 25 mm (1 in.) below it. 0–25mm ZMU02012 (0–1in.) ZMU02011...

  • Page 27: Breaking In Engine

    Operation board (if packed). For details, consult EMU27050 Gasoline and engine oil mixing chart your Yamaha dealer. (25:1) 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 28: Preoperation Checks

    Fuel tank capacity (if equipped Yamaha Check fuel line connections to be sure they fuel tank): are tight (if equipped Yamaha fuel tank or 25 L (6.60 US gal) (5.50 Imp.gal) boat tank). Be sure the fuel tank is positioned on a se-...

  • Page 29: Ring Free Fuel Additive

    Yamaha recommends the use of Replace the fuel tank cap and close Ring Free Fuel Additive, available from tightly. your Yamaha dealer. Ring Free Fuel Addi- Shake the fuel tank to mix the fuel thor- tive has repeatedly proven its ability to clean oughly.

  • Page 30: Operating Engine

    Operation Replace the fuel can cap and close tight- are flammable and explosive. Refrain from smoking, and keep away from Shake the fuel can to mix the fuel thor- open flames and sparks while loosen- oughly. ing the air vent screw. Make sure that the oil and gasoline are This product emits exhaust gases mixed.

  • Page 31: Starting Engine

    Operation ZMU03714 ZMU02024 If a steering friction adjuster is provided NOTE: on your outboard motor, securely attach The start-in-gear protection device prevents the fuel line to the fuel line clamp. the engine from starting except when in neu- NOTE: tral. During engine operation place the tank hori- Attach the engine stop switch lanyard to zontally, otherwise fuel cannot be drawn...
  • Page 32 Operation the engine will run poorly or stall. 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. ZMU03744 Place the throttle grip in the “ ”...
  • Page 33 Operation amount and try to start the engine again. If the engine still fails to start, see page 59. EMU27562 Electric start models Place the gear shift lever in neutral. ZMU03744 Place the throttle grip in the “ ” (start) position. After the engine starts, return the throttle to the fully closed po- sition.
  • Page 34 Operation If the choke knob is left in the “ ” (start) position while the engine is running, the engine will run poorly or stall. Push the starter button to start the mo- tor. (Repeat if necessary.) ZMU02962 NOTE: When the engine is cold, it needs to be warmed up.
  • Page 35 Operation a secure place on your clothing, or your arm or leg. Then install the lock plate on the other end of the lanyard into the en- gine stop switch. EWM00120 WARNING Attach the engine stop switch lanyard to a secure place on your clothing, or your arm or leg while operating.
  • Page 36 Operation 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. Then install the lock plate on the other end of the lanyard into the en- gine stop switch.
  • Page 37 Operation pressed in. START ZMU01880 ZMU02315 Open the throttle slightly without shifting NOTE: using the neutral throttle lever or free ac- celerator. You may need to change the It is not necessary to use the choke when throttle opening slightly depending on starting a warm engine.

  • Page 38: Warming Up Engine

    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 ZMU02030 dealer if the problem cannot be located Move the gear shift lever quickly and and corrected.

  • Page 39: Reverse (Manual Tilt And Hydro Tilt Models)

    Operation ZMU03718 ZMU02030 On models equipped with a tilt lock le- Remote control models ver, check that it is in the lock/down po- Pull up the neutral interlock trigger (if sition. equipped) and move the remote control lever quickly and firmly from neutral to forward.

  • Page 40: Stopping Engine

    Operation ZMU03690 ZMU03721 Pull up the neutral interlock trigger (if equipped) and move the remote control lever quickly and firmly from neutral to reverse. After stopping the engine, disconnect the fuel line if there is a fuel joint on the outboard motor.

  • Page 41: Trimming Outboard Motor

    Operation ZMU02041 Remove the key if the boat will be left unattended. NOTE: The engine can also be stopped by pulling the lanyard and removing the lock plate from the engine stop switch, then turning the main switch to “ ”...

  • Page 42: Adjusting Boat Trim

    Operation 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.

  • Page 43: Tilting Up And Down

    Operation and making it hard to increase speed. Oper- the engine will be tilted for more than a ating with excessive trim-in at higher speeds few minutes. Otherwise fuel may leak. also makes the boat unstable. Resistance at ECM00241 the bow is greatly increased, heightening the CAUTION: danger of “bow steering”...

  • Page 44: Procedure For Tilting Down (Manual Tilt Models)

    Operation ZMU03747 ZMU03725 Place the tilt lock lever in the release po- sition. ZMU03731 Slightly tilt the engine up until the tilt sup- ZMU03726 port bar is automatically released. Hold the rear of the top cowling with one Slowly tilt the engine down. hand, tilt the engine up, and turn the tilt EMU28060 Cruising in shallow water...
  • Page 45 Operation 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.

  • 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 ZMU03729 conditions.

  • Page 47: Maintenance

    25ER 51.0 kg (112 lb) Alternator output: 25MH 49.5 kg (109 lb) 25MH 80 W Performance: Alternator output for battery DC: Full throttle operating range: 25EH 6.0 A 5000–6000 r/min 25ER 6.0 A Maximum output: Drive unit: 18.4 kW@5500 r/min (25 HP@5500...

  • Page 48: Transporting And Storing Outboard Motor

    Never get under the lower unit while it is tilted, even if a motor support bar is used. Fuel tank capacity: Severe injury could occur if the outboard 25 L (6.60 US gal) (5.50 Imp.gal) motor accidentally falls. Recommended engine oil: ECM00660...

  • Page 49: Clamp Screw Mounting Models

    “Yamaha Fuel Conditioner and Stabilizer” (Part No. LUB-FUELC- 12-00) to each gallon of fuel. NOTE: The use of “Yamaha Fuel Conditioner and ZMU02869 Stabilizer” eliminates the need to drain the fuel system. Consult your Yamaha dealer or...

  • Page 50: Lubrication (Except Oil Injection Models)

    Seal replacement should be performed Cooling system flushing is essential to by an authorized Yamaha dealer prior to prevent the cooling system from clog- use. ging up with salt, sand, or dirt. In addi- Grease all grease fittings.

  • Page 51: Battery Care

    Wax the cowling with a non-abrasive ways apply. Consult your battery wax such as “Yamaha Silicone Wax” manufacturer’s instructions. (Part No. ACC-11000-15-02). Procedure EMU28430 Disconnect and remove the battery from Battery care the boat. Always disconnect the black...

  • Page 52: Periodic Maintenance

    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 sys- tems may be performed by any marine engine repair establishment or individual.

  • Page 53: 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 54: Greasing

    Maintenance Initial Every 50 hours Item Actions 10 hours hours (6 hours (1 (1 month) months) months) year) Cleaning / adjustment / Spark plug(s) replacement EMU28931 Greasing Yamaha marine grease (Water resistant grease) ZMU03734...

  • Page 55: Cleaning And Adjusting Spark Plug

    If electrode Spark plug torque: erosion becomes excessive, or if carbon and 25.0 Nm (18.4 ft-lb) (2.55 kgf-m) other deposits are excessive, you should re- place the spark plug with another of the cor- NOTE: rect type.

  • Page 56: Inspecting Fuel Filter

    Check the fuel lines for leaks, crack, or mal- which could result in a fire or explosion function. If a problem is found, your Yamaha hazard. dealer or other qualified mechanic should re- EMU29001 pair it immediately.

  • Page 57: Inspecting Idling Speed

    If you have difficulty ver- 1. Filter cup ifying the idle speed, or the idle speed re- 2. Filter element quires adjustment, consult a Yamaha dealer 3. Filter housing or other qualified mechanic. 4. O-ring Verify whether the idle speed is set to Reinstall the filter element in the cup.

  • Page 58: Checking Propeller

    Maintenance leaks from the joints between the exhaust cover, cylinder head, and body cylinder. EMU29171 Checking propeller EWM00321 WARNING You could be seriously injured if the en- gine accidentally starts when you are near the propeller. Before inspecting, removing, or install- ZMU01897 ing the propeller, remove the spark Checkpoints...

  • Page 59: Removing The Propeller

    Severe injury could the propeller could come off during op- occur if the outboard motor accidental- eration and be lost. ly falls. Apply Yamaha marine grease or a cor- Tilt the outboard motor so that the gear...

  • Page 60: Cleaning Fuel Tank

    If you have any question about properly into the gear case which can cause gear doing this procedure, consult your damage. Consult a Yamaha dealer for re- Yamaha dealer. pair of the lower unit seals. Keep away from sparks, cigarettes,...

  • Page 61: Inspecting And Replacing Anode(S)

    Inspect ground leads attached to external cal regulations. anodes on equipped models. Consult a Empty the fuel tank into an approved Yamaha dealer for inspection and replace- container. ment of internal anodes attached to the pow- Pour a small amount of suitable solvent er unit.

  • Page 62: Connecting The Battery

    ECM00360 charge the battery when it is low. CAUTION: NOTE: A poorly maintained battery will quickly Consult a Yamaha dealer when charging or deteriorate. re-charging batteries. Ordinary tap water contains minerals harmful to a battery, and should not be EMU29331 used for topping up.

  • Page 63: Disconnecting The Battery

    ATIVE (-) terminal first. Then disconnect the ZMU01943 RED cable from the POSITIVE (+) terminal. 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.

  • Page 64: 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 65 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 66 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 67: 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 68: Starter Will Not Operate

    An unguarded, rotating flywheel is very NOTE: dangerous. Keep loose clothing and Consult your Yamaha dealer if the new fuse other objects away when starting the immediately blows again. engine. Use the emergency starter rope only as instructed. Do not touch the fly-...
  • Page 69 Trouble Recovery ZMU03740 ZMU02334 1. Start-in-gear protection cable Remove the starter/flywheel cover after ON START removing the bolt(s). ZMU01906 If equipped the choke knob, pull out it when the engine is cold. After the engine starts, gradually return the choke knob ZMU03741 to its home position as the engine warms Prepare the engine for starting.

  • Page 70: Treatment Of Submerged Motor

    Treatment of submerged motor the carburetor(s) and spark plug holes If the outboard motor is submerged, immedi- while cranking with the manual starter or ately take it to a Yamaha dealer. Otherwise emergency starter rope. some corrosion may begin almost immedi- ately.

  • Page 71: Consumer Information

    Consumer information EMU29811 Important warranty information for U.S.A. and Canada...
  • Page 72 Consumer information...

  • Page 73: Yamaha Motor Corporation, U.s.a. Outboard Motor Two Year Limited Warranty

    Consumer information EMU29820 YAMAHA MOTOR CORPORATION, U.S.A. OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY...
  • Page 74 Consumer information...
  • Page 75 Consumer information...

  • Page 76: Important Warranty Information If You Use Your Yamaha Outside The Usa Or Canada

    Consumer information EMU29841 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA...
  • Page 78 Printed in Japan April 2006–0.2 × 1 ! Printed on recycled paper...
  • Page 79 (A l’usage du concessionnaire) MODÉLE ET NO. DE SÉRIE DU MOTEUR HORS-BORD (sur l’étiquette d’identification de la presse de fixation) YAMAHA DEALER NUMBER NO. DU CONCESSIONNAIRE YAMAHA DEALER NAME YAMAHA MOTOR CO., LTD. NOM DU MADE IN JAPAN CONCESSIONNAIRE PAYS D'ORIGINE JAPON USAGE...
  • Page 80 PLACE POSTAGE HERE ATTN: WARRANTY DEPARTMENT...

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