Yamaha 40M Owner's Manual

4050OWNER’S MANUAL63B-28199-1EU.S.A.EditionLIT-18626-06-5863B-9-1E Hyoshi 4/25/05 9:39 AM Page 1

General information 5 sel head-on) Crossing: (you are traveling across the oth-er vessel’s path) Overtaking: (you are passing or beingpassed by ano

General information 6 bend that may obstruct the view of other wa-ter vessels, the operator should sound a pro-longed blast on the whistle (4 to 6 se

General information 7 EMU25540 Fueling instructionsWARNING EWM00010 GASOLINE AND ITS VAPORS ARE HIGH-LY FLAMMABLE AND EXPLOSIVE! ● Do not smoke when

General information 8 dry rags. ● Do not overfill the fuel tank. ● Tighten the filler cap securely after re-fueling. ● If you should swallow some gas

General information 9 speed is too high or too low for good engineperformance, this will have an adverse effecton the engine.Yamaha outboard motors a

10 Basic components EMU25796 Main componentsNOTE: * May not be exactly as shown; also may not be included as standard equipment on all mod- els. 40,

Basic components 11 tions. EMU25830 Fuel joint This joint is used to connect the fuel line. EMU25841 Fuel gauge This gauge is located on either the f

Basic components 12 EMU26201 Neutral interlock trigger To shift out of neutral, first pull the neutral in-terlock trigger up. EMU26211 Neutral thrott

Basic components 13 EMU25941 Throttle grip The throttle grip is on the tiller handle. Turnthe grip counterclockwise to increase speedand clockwise to

Basic components 14 When constant speed is desired, tighten theadjuster to maintain the desired throttle set-ting. EMU25990 Engine stop lanyard switc

EMU25060ZMU01690 Read this owner’s manual carefully before operating your outboard motor.63B-9-1E Hyoshi 4/25/05 9:39 AM Page 2

Basic components 15 EMU26090 Main switch The main switch controls the ignition system;its operation is described below. ● “” (off) With the main swi

Basic components 16 EMU26151 Power trim and tilt switch on bottom engine cowling The power trim and tilt switch is located onthe side of the bottom e

Basic components 17 EMU26261 Trim rod (tilt pin) The position of the trim rod determines theminimum trim angle of the outboard motor inrelation to th

Basic components 18 EMU26470 Tachometer This gauge shows the engine speed and hasthe following functions. EMU26491 Digital tachometer The tachometer

Basic components 19 rious engine damage will occur. EMU26581 Overheat warning indicator (digital type) If the engine temperature rises too high, thew

Basic components 20 engine has been run. It can be set to showthe total number of hours or the number ofhours for the current trip. The display canal

Basic components 21 EMU26845 Oil level warning and oil filter clogging warning Oil injection models This engine has an oil level warning system.If th

Basic components 221. Oil filterZMU033661✩✦✯✬✤✲✲✣ ✥✥  

23 Operation EMU26901 InstallationCAUTION: ECM00110 Incorrect engine height or obstructionsto smooth water flow (such as the designor condition of t

Operation 24 motor greatly affects the water resistance. Ifthe mounting height is too high, cavitationtends to occur, thus reducing the propulsion;an

Important manual information EMU31280 To the owner Thank you for choosing a Yamaha outboardmotor. This Owner’s Manual contains infor-mation needed fo

Operation 25 board (if packed). For details, consultyour Yamaha dealer.WARNING EWM00650 Avoid using bolts, nuts or washers otherthan those contained

Operation 26 cool.4. Third through tenth hours:Avoid operating at full throttle for morethan 5 minutes at a time. Let the enginecool between full-thr

Operation 27CAUTION: ECM00130 Be sure to take the above steps when op-erating the engine after a long period ofstorage. Otherwise engine seizure cou

Operation 28 EMU27311 Filling oil for electric start modelsWARNING EWM00530 Do not add gasoline into the oil tank. Fire or explosion could result. T

Operation 29 EMU27321 Oil level indicator operation The various functions of the oil level system are as follows: EMU27350 Electric start models EMU2

Operation 30 tank cap, loosen it 2 or 3 turns.2. If there is a fuel joint on the motor, firmlyconnect the fuel line to the joint. Thenfirmly connect

Operation 31 gine stop switch.WARNING EWM00120 ● Attach the engine stop switch lanyardto a secure place on your clothing, oryour arm or leg while op

Operation 32 EMU27662 Electric start and remote control models 1. Place the remote control lever in neutral.NOTE: The start-in-gear protection device

Operation 33 again.NOTE: ● When the engine is cold, it needs to bewarmed up. For further information, seepage 33. ● If the engine is warm and fails t

Operation 34 firmly from neutral to forward.Remote control models1. Pull up the neutral interlock trigger (ifequipped) and move the remote controllev

Table of contents General information ... 1 Identification numbers record... 1 Outboard motor serial number ...

Operation 35 ping the engine immediately after operatingat high speed is not recommended. EMU27844 Procedure 1. Push and hold the engine stop button

Operation 36 EMU27881 Adjusting trim angle Power trim and tilt modelsWARNING EWM00750 ● Be sure all people are clear of the out-board motor when adj

Operation 37 “” (down).Make test runs with the trim set to differentangles to find the position that works best foryour boat and operating conditions

Operation 38 sion with obstructions, and also to reducesalt corrosion.WARNING EWM00220 Be sure all people are clear of the out-board motor when tilt

Operation 39 4. Push the tilt support knob into the clampbracket or pull the tilt support lever to-ward you to support the engine.WARNING EWM00260 A

Operation 40 3. Push the power tilt / power trim and tiltswitch “” (down) to lower the outboardmotor to the desired position. EMU28060 Cruising in sh

Operation 41 2. Slightly tilt the outboard motor up to thedesired position using the power trim / tiltswitch.3. To return the outboard motor to the n

42 Maintenance EMU28217 Specifications Dimension: Overall length:40TR 646 mm (25.4 in)50TR 670 mm (26.4 in)Overall width:40TR 350 mm (13.8 in)50TR 36

Maintenance 43 Spark plug:25.0 Nm (18.4 ft-lb) (2.55 kgf-m)Propeller nut:35.0 Nm (25.8 ft-lb) (3.57 kgf-m) EMU28222 Transporting and storing outboard

Maintenance 44 ventilated place, not in direct sunlight. EMU28301 Procedure EMU28372 Flushing in a test tank 1. Wash the outboard motor body usingfre

Table of contents models ... 33 Shifting ... 33 Forward (tiller handle

Maintenance 45 cowling. EMU28410 Lubrication (oil injection models) 1. Grease the spark plug threads and in-stall the spark plug(s) and torque toprop

Maintenance 46 4. Once a month, check the specific gravityof the electrolyte and recharge as re-quired to prolong battery life. EMU28450 Cleaning the

Maintenance 47 EMU28522 Maintenance chart Frequency of maintenance operations may be adjusted according to the operating condi-tions, but the followi

Maintenance 48Water pumpInspection / replace-mentOil pump Inspection / adjustmentOil tank water drain Inspection / cleaningSpark plug(s)Cleaning / ad

Maintenance 49 EMU28931 Greasing Yamaha marine grease (Water resistant grease) 40, 50 EMU28952 Cleaning and adjusting spark plugWARNING EWM00560 Whe

Maintenance 50 Yamaha dealer. You should periodically re-move and inspect the spark plug becauseheat and deposits will cause the spark plugto slowly

Maintenance 51 Checkpoints ● Fuel system parts leakage ● Fuel line joint leakage ● Fuel line cracks or other damage ● Fuel connector leakage EMU28980

Maintenance 52 4. Reinstall the filter element in the cup.Make sure the O-ring is in position in thecup. Firmly screw the cup onto the filterhousing.

Maintenance 53 curely. EMU29120 Exhaust leakage Start the engine and check that no exhaustleaks from the joints between the exhaustcover, cylinder he

Maintenance 54 move the key, and remove the lanyardfrom the engine stop switch. Turn offthe battery cut-off switch if your boathas one. ● Do not use

1 General information EMU25170 Identification numbers record EMU25182 Outboard motor serial number The outboard motor serial number isstamped on the

Maintenance 55 3. Remove the propeller and thrust wash-er. EMU30670 Installing the Propeller EMU29231 Spline modelsCAUTION: ECM00340 ● Be sure to in

Maintenance 56 the screw before installing it.4. Remove the oil level plug to allow the oilto drain completely.CAUTION: ECM00710 Inspect the used oi

Maintenance 57 suction pipe) in a suitable cleaning sol-vent. Allow the filter to dry.5. Replace the gasket with a new one. Re-install the fuel joint

Maintenance 58 followed by milk of magnesia, beatenegg, or vegetable oil. Get immediatemedical attention.Batteries also generate explosive hydro-gen

Maintenance 59 minal. EMU29370 Disconnecting the battery Disconnect the BLACK cable from the NEG-ATIVE (-) terminal first. Then disconnect theRED cab

60 Trouble Recovery EMU29424 Troubleshooting A problem in the fuel, compression, or igni-tion systems can cause poor starting, loss ofpower, or other

Trouble Recovery 61 Q. Is fuel system obstructed?A. Check for pinched or kinked fuel line orother obstructions in fuel system.Q. Is fuel contaminated

Trouble Recovery 62 A. Have serviced by a Yamaha dealer.Q. Is load on boat improperly distributed?A. Distribute load to place boat on an evenplane.Q.

Trouble Recovery 63 Q. Is fuel joint connection incorrect?A. Connect correctly.Q. Is heat range of spark plug incorrect?A. Inspect spark plug and rep

Trouble Recovery 64NOTE: Consult your Yamaha dealer if the new fuse immediately blows again. EMU29522 Power trim and tilt / power tilt will not opera

General information 2 EMU25262 Manufactured date label This label is attached to the clamp bracket orthe swivel bracket. EMU25362 Safety information

Trouble Recovery 65 wheel or other moving parts when theengine is running. Do not install thestarter mechanism or top cowling afterthe engine is runn

Trouble Recovery 66NOTE: When the engine does not start with this pro- cedure, see page 66. EMU29670 Engine fails to operate EMU29704 Cold engine fai

Trouble Recovery 67 6. Turn the main switch to “” (start).CAUTION: ECM00191 ● Never turn the main switch to “”(start) while the engine is running. ●

Trouble Recovery 68 3. Drain the fuel from the carburetor, fuelfilter, and fuel line.4. Feed fogging oil or engine oil throughthe carburetor(s) and s

69 Consumer information EMU29811 Important warranty information for U.S.A. and Canada✩✦✯✬✤✲✲✣ ✩✬  

Consumer information 70✩✦✯✬✤✲✲✣ ✪✣  

Consumer information 71 EMU29820 YAMAHA MOTOR CORPORATION, U.S.A. OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY✩✦✯✬✤✲✲✣ ✪✤  

Consumer information 72✩✦✯✬✤✲✲✣ ✪✥  

Consumer information 73✩✦✯✬✤✲✲✣ ✪✦  

Consumer information 74 EMU29841 IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR YAMAHA OUTSIDE THE USA OR CANADA✩✦✯✬✤✲✲✣ ✪✧  

General information 3 clude nausea, dizziness, and drowsiness.Keep cockpit and cabin areas well ventilat-ed. Avoid blocking exhaust outlets. ● Check

Printed in JapanMay 2005–0.8 × 1 !Printed on raecycled paper63B-9-1E Hyoshi 4/25/05 9:39 AM Page 4

YAMAHA MOTOR CO., LTD.MADE IN JAPANPAYS D'ORIGINE JAPONOUTBOARD MOTOR WARRANTY REGISTRATIONENREGISTREMENT DE LA GARANTIE DU MOTEUR HORS-BORDPleas

PLACEPOSTAGEHEREATTN: WARRANTY DEPARTMENT Warranty card-04 2/17/03 2:41 PM Page 2

General information 4 EMU25401 LabelWARNING EWM01260 ● Be sure shift control is in neutral beforestarting engine. (except 2HP) ● Do not touch or rem