1. Yamaha 25 Hp Outboard Manual Download Pdf Manuals
2. Yamaha 25 Hp Outboard Manual Pdf
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4. Yamaha 25 Hp Outboard For Sale

A downloadable Yamaha 25hp outboard repair manual is a digitally delivered handbook describing how to fix a specific type of motor, called an outboard motor. Yamaha 25 horsepower outboard motors are small propulsion systems for boats. They contain the motor, transmission, and propelling mechanism all in a single unit. Since these must be carefully built and designed to fit in a small space, special knowledge is necessary to maintain them. This is why a 25hp Yamaha outboard repair manual is important, and why having a manual specific to a motor’s model is essential.

View and Download Yamaha F25 owner's manual online. F25 Outboard Motor pdf manual download. Also for: T25. Yamaha outboard motors are protected from corrosion by sacrificial anodes. Inspect the ZMU03664 external anodes periodically. Remove scales from the surfaces of the anodes. Consult a Yamaha dealer for replacement of external anodes. Oct 02, 2018 A 1998 1999 2000 2001 2008 2009 2010 2011 Yamaha outboard 25hp 2-stroke and 4-stroke 2002 2003 2004 2005 2006 2007 repair manual, also termed 25hp factory se. Oct 02, 2018  A 1998 1999 2000 2001 2008 2009 2010 2011 Yamaha outboard 25hp 2-stroke and 4-stroke 2002 2003 2004 2005 2006 2007 repair manual, also termed 25hp factory se. Yamaha Outboard Repair Manuals Download a repair manual to your computer, tablet or smart phone instantly. All manuals are in pdf format for quick easy download.

The term repair manual can be used for multiple different types of manuals, including owner manuals, factory service manuals, owner workshop manuals, and repair manuals. Each of these have a slightly different function, but they all have the same general purpose of keeping an outboard motor in top working order. Owner manuals contain safety and use instructions for an outboard motor, as well as simple procedures a user can follow when troubleshooting. A Yamaha 25hp factory service manual is issued by the manufacturer, and contain general guidelines for outboard motor servicing, maintenance, and repair. Yamaha owner workshop manuals are made for people who like to customize and service their outboard motors. Yamaha 25 hp repair manuals are written to be as easy to understand as possible, so outboard motor owners can use them when trying to make their own repairs. Depending on someone’s mechanical knowledge, one or all of these may be useful when owning an outboard motor.

Motor companies often create many different types of outboard motors, either specialized for certain situations or improving on older models. Every new model requires at least one of the manual types listed above, because small differences in motor construction or materials can make a big difference in how the motor must be maintained. Some companies maintain an extensive library of manuals. If the entire catalog of manuals is written in a consistent way, this can help outboard motor owners acclimate to new models. If they are used to how a previous model is described, learning to use and repair a new model that is described in the same way is much easier.

The most technically complicated repair manuals contain different sections concerning each part of the outboard motor and its associated components, including the fuel system, cooling system, electrical system, and ignition system. They contain troubleshooting charts, diagrams, indexes, and reference information. Modern manuals also contain a lot of software information, such as running system analysis and managing the computer inside the engine. Simple owner manuals usually don’t go into software too deeply, but each of the more in-depth manual types may, depending on the motor.

An owner manual is usually included with the purchase of an outboard motor, but interested owners can often get the other types of repair manuals directly from the manufacturer. Many of these manuals can be found in their entirety on the internet. When searching for these other manuals, it’s important to make sure they come from a reputable source, preferably from a site linked directly with the company in some way. Counterfeit manuals can potentially be a safety hazard.

Whatever style of outboard motor owner someone is, there is a repair manual to suit their needs. An owner might still need some repair help from a professional sometimes, but a well-written repair manual can take a lot of the headaches and hassle out of diagnosing problems and repairing them. Outboard motor owners should always keep their repair manuals, because no one ever knows when some maintenance or repair might be needed.

Yamaha 25hp Repair Manuals Available

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Service Repair Manual Application: 1997-1998 Yamaha Marine Outboard 20HP (20-HP) & 25HP 25-HP) 10V, 25V, 25V2 2-Stroke Engines LIT-18616-01-66.

1997-1998 Model Names:

20DM (20-DM)
20DMO (20-DMO)
20DEM (20-DEM)
20DEMO (20-DEMO)
20DERO (20-DERO)
20MH (20-MH)
20MH2 (20-MH2)
20EH (20-EH)
20EH2 (20-EH2)
25DM (25-DM)
25NMO (25-NMO)
25NEMO (25-NEMO)
25NE (25-NE)
25NEO (25-NEO)
25NERO (25-NERO)
25MH (25-MH)
25MH2 (25-MH2)
25EH (25-EH)
25ER (25-ER)

This service manual describes the service procedures for the complete Yamaha Outboard motor. Follow the Maintenance Schedule recommendations to ensure that the engine is in peak operating condition. Performing the scheduled maintenance is very important. It compensates for the initial wear that occurs during the life of the engine.

All chapters in the service manuals apply to the whole Yamaha Outboard engine and illustrates procedures for removal & installation of components that are in detailed step-by-step fashion.

All service manual chapters start with an assembly or system illustration, diagrams, exploded parts view, quality pictures, service information and troubleshooting for the section. The subsequent pages give detailed procedures. If you dont know the source of the trouble, go to the troubleshooting page located at the end of the manual for a list of causes and effects to determine the problem.

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Typical chapters in a Yamaha Outboard Service Manual (chapters may differ depending on year/model):

IMPORTANT INFORMATION
MAINTENANCE SCHEDULE
OUTBOARD MOTOR INSTALLATION
ELECTRICAL
FUEL SYSTEM
POWERHEAD – TOP END
MID-SECTION
LOWER UNIT
ATTACHMENTS – CONTROL LINKAGE
TROUBLESHOOTING

Manual Language: ENGLISH
Pages: 148
File Format: PDF
File Delivered In: PDF Format
Bookmarked for easy navigation: YES
Zoom in/out: YES
Works on all computers!

RELATED SEARCHES FOR YAMAHA OUTBOARD ENGINES:

CYLINDER COMPRESSION

Cylinder compression :

Standard : 1300 1700 kPa (13 17 kg/cm2, 185 242 psi.)

Max. difference between any other cylinders : 100kPa (1.0 kg/cm2, 14 psi.)

NOTE: Figures shown are guidelines only, not absolute service limits. Low compression pressure can indicate one or more of following
:
Excessively worn cylinder wall
Worn piston or piston rings
Stuck piston rings
Poor seating of valves
Ruptured or otherwise damaged cylinder head gasket

TEST PROCEDURE

1. Start engine and allow to warm up, then shut engine off.
2. Remove STBD / PORT side covers.
3. Remove all spark plugs.
4. Install compression gauge hose attachment into plug hole, then connect compression gauge hose to gauge hose attachment and compression gauge.

Compression gauge
Compression gauge hose
Compression gauge hose attachment

5. Disconnect safety lanyard (switch plate) from emergency stop switch. Disconnect the safety lanyard from the emergency stop switch prior to cranking the engine. This will prevent any residual fuel discharged from the cylinders being ignited by a spark discharge from the spark plug caps.
6. Disconnect remote control throttle cable from throttle lever.
7. Move and hold throttle lever in full-open position.
8. While cranking engine with starter motor, note maximum compression pressure reading on gauge for each cylinder.
9. Reinstall parts removed earlier. (spark plugs, side covers, etc.)

TROUBLESHOOTING GUIDE

Excessive exhaust noise
Deformed exhaust system
Exhaust gas leaks
Poor performance

Clogged muffler
Broken exhaust system
Exhaust gas leaks
LUBRICATION SYSTEM TROUBLESHOOTING

Oil level too low – high oil consumption

Oil consumption
External oil leak
Worn piston rings or incorrect piston ring installation
Worn cylinder
Worn valve guide or stem seals
Oil pump worn or damaged
Oil contamination

Oil or filter not changed often enough
Worn piston rings or incorrect piston ring installation
Worn valve guide or stem seals
FUEL SYSTEM TROUBLESHOOTING

Engine cranks but wont start

No fuel in tank
No fuel to carburetor
Clogged fuel strainer
Clogged fuel line
Clogged fuel tank breather tube
Misadjusted fuel level
Too much fuel getting to the engine
Clogged air cleaner
Flooded carburetor
Intake air leak
Contaminated/deteriorated fuel
Clogged jets
Clogged starting enrichment valve circuit
Improper starting enrichment valve operation
Improper throttle operation
No spark at plug (faulty ignition system)
Lean mixture

Clogged fuel jets
Faulty float valve
Float level too low
Restricted fuel line
Clogged carburetor air vent tube
Restricted fuel tank breather tube
Intake air leak
Faulty vacuum piston
Faulty throttle valve
Rich mixture

Starting enrichment valve open (ON)
Clogged air jets
Faulty float valve
Float level too high
Dirty air cleaner
Worn jet needle or needle jet
Faulty vacuum piston
Engine stalls, hard to start, rough idling

Restricted fuel line
Fuel mixture too lean/rich
Contaminated/deteriorated fuel
Clogged jets
Intake air leak
Mis-adjusted idle speed
Misadjusted pilot screw
Misadjusted float level
Restricted fuel tank breather tube
Clogged air cleaner
Clogged slow circuit
Clogged starting enrichment valve circuit
Faulty ignition system
Backfiring or misfiring during acceleration

Lean mixture
Faulty ignition system
Poor performance and poor fuel economy

Clogged fuel system
Faulty ignition system
CYLINDER HEAD/VALVE TROUBLESHOOTING

Engine top-end problems usually affect engine performance. These can be diagnosed by a compression test, or by tracing top-end noise with a sounding rod or stethoscope. If the performance is poor at low speeds, check for a white smoke in the crankcase breather tube. If the tube is smoky, check for seized piston ring

Compression too low, hard starting or poor performance at low speed

Valves

Incorrect valve adjustment
Burned or bent valves
Incorrect valve timing
Broken valve spring
Uneven valve seating
Valve stuck open

Cylinder head

Leaking or damaged cylinder head gasket
Warped or cracked cylinder head
Loose spark plug

Compression too high

Excessive carbon build-up on piston head or
combustion chamber
Worn or damaged decompressor system

Excessive smoke

Yamaha 25 Hp Outboard Manual Download Pdf Manuals

Worn valve stem or valve guide
Damaged stem seal
Cylinder/piston problem

Excessive noise

Incorrect valve clearance
Sticking valve or broken valve spring
Excessive worn valve seat
Worn or damaged camshaft
Worn rocker arm and/or shaft
Worn rocker arm follower or valve stem end
Worn or damaged push rod and/or cam follower
Worn cam chain
Worn or damaged cam chain tension er
Worn cam sprocket teeth
Cylinder/piston problem

Rough idle

Low cylinder compression

CYLINDER/PISTON TROUBLESHOOTING

Compression too low, hard starting or poor performance at low speed

Leaking cylinder head gasket
Worn, stuck or broken piston ring
Worn or damaged cylinder and piston
Bent connecting rod
Compression too high, overheating or knocking

Excessive carbon built-up on piston head or combustion chamber
Excessive smoke

Worn cylinder, piston or piston rings
Improper installation of piston rings
Scored or scratched piston or cylinder wall
Abnormal noise

Worn piston pin or piston pin hole
Worn connecting rod small end
Worn cylinder, piston or piston rings
ALTERNATOR/STARTER CLUTCH TROUBLESHOOTING

Starter motor turns, but engine does not turn

Faulty starter clutch
Damaged starter reduction gear
CRANKCASE/TRANSMISSION/CRANKSHAFT TROUBLESHOOTING

Excessive engine noise

Worn, seized or chipped transmission gears
Worn transmission bearings
Worn or damaged connecting rod bearing
Worn crankshaft main journal bearing
Worn connecting rod small end
Worn balancer bearing
Improper balancer installation
Consistent noise during cruising

Oil level too low
Foreign matter contaminating gear oil
Worn or damaged bearing
Worn or damaged ring gear and pinion gear
Deformed ring gear or differential case
Improper tooth contact between ring gear and pinion gear
Abnormal noises at start or during acceleration

Excessive backlash between ring gear and pinion gear
Worn differential splines
Loose fasteners
Worn cone spring or shim
Oil leak

Oil level too high
Clogged breather
Damaged seals
Loose case cover bolt
Over heating – Overheating

Oil level too low
Insufficient backlash between ring gear and pinion gear
Oil leak

Oil level too high
Clogged breather
Damaged seals
Loose case cover bolt

Yamaha Outboard Service Manual, Repair Manual, Shop Manual, Owner’s Workshop Manual, Engine Repair Guide, Handbook, Book, Learning Guide, Study Guide, Factory Engine Rebuild Manual 1997-1998 Yamaha Marine Outboard 20HP (20-HP) & 25HP 25-HP) 10V, 25V, 25V2 2-Stroke Engines LIT-18616-01-66. LIT18160166, 186160166, TwoStroke, Two Stroke.

Propeller Information Charts, Propeller Selection, Propeller Removal & Installation, aluminum prop, steel prop, 4 blades, 3 blade, Torque Specifications, Inspection And Maintenance Schedule, Spark Plug Inspection, Fuse Replacement, Electric Start Models, Start in Gear Protection, Transom Bracket, Checking Power Trim Fluid, Power Trim System, Fuel System, Electric Fuel Pump, Recommended Battery, Battery Inspection, Battery Cable Connections.

Powerhead Views, Installation Drawing, Trim Tab Adjustment, Trim-In Stop Adjustment, Painting Procedures, Decals, Decal Application, Steering Cable, Steering Link Rod, Hoses, and Control Cables, Flywheel Assembly, Flywheel, Ignition Components, Coils, Ignition Test Procedures, Ignition Component Description, Starting and Idling, Starter Relay, Starter Solenoid Test, Starter Motor, Alternator System Test, 25 Ampere Stator, Stator Removal and Installation, Stator Coil, Stator Coil Peak Voltage, Electronic Control Module (ECM), Air Temperature Sensor, Throttle Position Sensor (TPS), Engine Water Temperature Sensor, Crank Position Sensors (CPS), Idle Air Control (IAC)

Yamaha 25 Hp Outboard Manual Pdf

Water Pump, Water Pump Reassembly and Installation, Oil Pump, Oil Pressure Switch, Timing Belt Removal and Installation, Rectifier, Throttle Shutter Synchronization, Throttle Cam Adjustment, Throttle Shaft Adjustment, Pressure Regulator, EFI, Fuel Injectors, Fuel Hoses, Fuel Injection Nozzle, 10 ethanol in gasoline, 10 ethanol gas problems, Gas, 91, Octane, 89 Petrol, 93 Octane, Fuel Additive, Carburetor, Rebuilt Carburetor, Adjusting The Carburetor, Warming Up, Cold Start, Fuel Pump, Fuel Filter, Water In Fuel Filter

Yamaha 25 Hp Outboard Manual Download Windows 7

Rebuilt cyliner Block, Cylinder Block And Crankcase, Cylinder Head Removal, Cylinder Head Disassembly, Camshaft, Thermostat, Valves, Valve Springs, Cylinder Head, Valve Guides, Valve Seats, Cylinder Head Installation, Following Cylinder Head Installation, Shift Shaft, Upper Drive Shaft Bearing, Wiring Diagram, Fuel Flow Diagram, Oil Flow Diagram, Water Flow Diagram, Throttle Shift Linkage, Tiller Handle, Manual Starter.

Yamaha 25 Hp Outboard For Sale

Tags: 1997-1998 yamaha 2-stroke service manual 20hp, 1997-1998 25 hp outboard engine repair guide yamaha