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.
Mar 06, 2015 Download a 25HP outboard repair manual in seconds. An outboard marine engine repair manual is a book of instructions, or handbook, for learning how to maintain, service and overhaul the 25 HP outboard motor to factory specifications.
Download DOWNLOAD 1997 1998 Yamaha 20HP 25HP Service Manual 20 25 HP
Yamaha 25hp 2 Stroke Service Manual.pdf - Free download Ebook, Handbook, Textbook, User Guide PDF files on the internet quickly and easily.
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.
1 Click on the instant download button to buy your repair manual now. 2. Pay with your credit card or with credit card through Paypal (NO REGISTRATION REQUIRED). 3. After Payment you will be redirected to the download page. 4. After Download is complete you can save it to your computer forever, print pages from it or even burn it to a CD.
A very easy simple download at a great price!
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!
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.
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
It would be impossible to build a car that could not have faults, at least if you wanted it to move in the first place.
Although many of the early American cars were very much in the category of ”dirt-track brawler”, being the kind of vehicle that could hold its own in a fight but not built for luxury, General Motors spotted a gap in the market for something that could boast a little bit more quality, and the Buick brand was born. Since then it has become one of the most enduringly popular brands of car in America and beyond.The major selling point of a Buick is its quality, but this does not mean that the cars are immune to faults. However, as long as faults are spotted early and the right approach is taken to fixing the problem, it is possible to save on repair costs. The reputation of Buick cars is one that has been formed over the course of many years.
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
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
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
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)
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
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.
Tags: 1997-1998 yamaha 2-stroke service manual 20hp, 1997-1998 25 hp outboard engine repair guide yamaha
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.
1 Click on the instant download button to buy your repair manual now. 2. Pay with your credit card or with credit card through Paypal (NO REGISTRATION REQUIRED). 3. After Payment you will be redirected to the download page. 4. After Download is complete you can save it to your computer forever, print pages from it or even burn it to a CD.
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!
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.
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
Yamaha 25 Hp Outboard 2 Stroke
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
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
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.