Aug 05, 2011 Download DOWNLOAD 1997 1998 Yamaha 20HP 25HP Service Manual 20 25 HP. 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. 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. Aug 10, 2013 Tag Archives: DOWNLOAD Yamaha Outboard 25HP 25 HP Service Manual DOWNLOAD Yamaha Outboard 25HP 25 HP Service Manual 1998-2006. Posted on August 10, 2013 by gaoqin. This Yamaha outboard motor pdf service manual download describes the service procedures for the complete engine. All chapters in the Yamaha service manuals apply to the whole. Aug 04, 2011 Download DOWNLOAD Yamaha 2010 25HP (25 HP) Service Manual Outboard F25 T25. Service Repair Manual Application: 2010 (10) Yamaha Marine Outboard 25HP (25-HP) 4-Stroke (Four Stroke) F25 T25 2 cylinder SOHC L2 Carburetor Engines, LIT-18616-03-17. This is an excellent qu.
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Service Repair Manual Application: 2010 (10) Yamaha Marine Outboard 25HP (25-HP) 4-Stroke (Four Stroke) F25 T25 2 cylinder SOHC L2 Carburetor Engines, LIT-18616-03-17. This is an excellent quality pdf eBook service manual, simple to download and worth every penny.
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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A very easy simple download at a great price!
Typical chapters in a Yamaha Outboard Service Manual (chapters may differ depending on year/model):
This manual covers all repair topics such as:
General Information
Periodic Maintenance Specifications Fuel System Tech Features Rigging info Troubleshooting Power Unit Lower Unit Bracket Unit Electrical System Detailed Diagrams, illustrations, photos, exploded views and step-by-step Instructions Diagnostics and similar topics.
Manual Language: ENGLISH
Pages: 399 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 Yamaha 25 Hp Outboard Service Manual
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
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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
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 Yamaha Outboard 50 Hp Manual
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 2010 4-Stroke, Four Stroke, 4Stroke. Yamaha Marine Outboard Model name.
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) F25MHA, F25EHA, F25EA, F25A, T25A, 6BP, 6BL.
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, Fuel Hoses, 10 ethanol in gasoline, 10 ethanol gas problems, Gas, 91, Octane, 89 Petrol, 93 Octane, Fuel Additive, Fuel Inj system, Injectors, Adjusting, Carb, Carburetor, Rebuild Carburetor Warming Up, Cold Start, Fuel Pump, Fuel Filter, Water In Fuel Filter, 25 motor, yamaha outboard 25hp outbord engine.
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.
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