Download Yamaha 250 Outboard Ox66 Manual
- Sep 17, 2013 Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. I own a 2002 Yamaha OX66 225. I was out working on the motor this evening and took the shop manual with me. I started right at the general maintenance in the beginning of the manual.
- Aug 05, 2011 Download DOWNLOAD 2003 2006 Yamaha Outboard 250HP 250 HP Service Manual. Service Repair Manual Application: 2003, 2004, 2005, 2006 Yamaha Marine Outboard 250HP (250.
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A Yamaha outboard motor is a purchase of a lifetime and is the highest rated in reliability. Owner Manuals offer all the information to maintain your outboard motor. Find a Dealer. V6 4.2L 250 / 225 / 200 hp. Power for bass, flats & multi-species boats. IN-LINE 4 175 / 150 / 115 / 90 hp. Download: Yamaha TDR-250 1988-1993 Download: Yamaha TT-350 1985-1996 Download: Yamaha TT600R 1997-2007 Download: Yamaha TT-R50e 2006-2009 Download: Yamaha TTR90(M) 2000-2002. Yamaha Outboard Service Manuals. Yamaha Marine Outboard 6v 8v Download: Yamaha Marine Outboard 9.9 15 (N-Q) Download: Yamaha Marine Outboard 9.9C 15C.
Download DOWNLOAD 2003 2006 Yamaha Outboard 250HP 250 HP Service Manual.
Service Repair Manual Application: 2003, 2004, 2005, 2006 Yamaha Marine Outboard 250HP (250-HP) 2-Stroke & 4-Stroke Engines. LIT-18616-02-78, LIT-18616-02-43 & LIT-18616-02-97
EXACT MODELS & YEARS COVERED
LIT-18616-02-78 – 2004-2005 Z250C & LZ250C MODEL NAME Z250TR/LZ250TR 2-STROKE ENGINE.
LIT-18616-02-43 – 2003-2005 Z250B & LZ250B MODEL NAME Z250TR/LZ250TR 2-STROKE ENGINE
LIT-18616-02-97 – 2005-2006 F250 & LF250 F250TR/LF250TR 4-STROKE ENGINE
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: 1118
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
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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
Yamaha 250 Ox66 Review
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
Starter motor turns, but engine does not turn
Yamaha Ox66 250 Hp Reviews
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 2003, 2004, 2005, 2006 Yamaha Marine Outboard 250HP (250-HP) 2-Stroke & 4-Stroke Engines. LIT-18616-02-78, LIT-18616-02-43 & LIT-18616-02-97. 2004-2005 Z250C & LZ250C (Z-LZ-250-C), 2003-2005 Z250B & LZ250B (Z-LZ-250-B), 2005-2006 F250 & LF250 (F-250, LF-250).
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.
Yamaha 250 Ox66 Parts
Tags: 2-stroke outboard 250 hp yamaha repair manual, 4-stroke yamaha outboard 250h engine repair