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Honda GX660 User Manual

Honda GX660
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A Few Words About Safety
SERVICE INFORMATION
The service and repair information contained in this manual is intended for use by qualified, professional technicians. Attempting
service or repairs without the proper training, tools, and equipment could cause injury to you and/or others. It could also damage
this Honda product or create an unsafe condition.
This manual describes the proper methods and procedures for performing service, maintenance, and repairs. Some procedures
require the use special tools. Any person who intends to use a replacement part, service procedure or a tool that is not
recommended by Honda, must determine the risks to their personal safety and the safe operation of this product.
If you need to replace a part, use Honda Genuine parts with the correct part number or an equivalent part. We strongly recommend
that you do not use replacement parts of inferior quality.
For Your Customer’s Safety
Proper service and maintenance are essential to the customer’s safety and the reliability of this product. Any error or oversight
while servicing this product can result in faulty operation, damage to the product, or injury to others.
For Your Safety
Because this manual is intended for the professional service technician, we do not provide warnings about many basic shop safety
practices (e.g., Hot parts-wear gloves). If you have not received shop safety training or do not feel confident about your knowledge
of safe servicing practice, we recommend that you do not attempt to perform the procedures described in this manual.
Some of the most important general service safety precautions are given below. However, we cannot warn you of every
conceivable hazard that can arise in performing service and repair procedures. Only you can decide whether or not you should
perform a given task.
Important Safety Precautions
Make sure you have a clear understanding of all basic shop safety practices and that you are wearing appropriate clothing and
using safety equipment. When performing any service task, be especially careful of the following:
Read all of the instructions before you begin, and make sure you have the tools, the replacement or repair parts, and the skills
required to perform the tasks safely and completely.
Protect your eyes by using proper safety glasses, goggles, or face shields anytime you hammer, drill, grind, or work around
pressurized air, pressurized liquids, springs or other stored-energy components. If there is any doubt, put on eye protection.
Use other protective wear when necessary, for example gloves or safety shoes. Handling hot or sharp parts can cause severe
burns or cuts. Before you grab something that looks like it can hurt you, stop and put on gloves.
Protect yourself and others whenever you have engine-power equipment up in the air. Anytime you lift this product with a hoist,
make sure that the hoist hook is securely attached to the product.
Make sure the engine is off before you begin any servicing procedures, unless the instruction tells you to do otherwise. This will
help eliminate several potential hazards:
Carbon monoxide poisoning from engine exhaust. Be sure there is adequate ventilation whenever you run the engine.
Burns from hot parts. Let the engine and exhaust system cool before working in those areas.
Injury from moving parts. If the instruction tells you to run the engine, be sure your hands, fingers and clothing are out of the way.
Gasoline vapors and hydrogen gasses from battery are explosive. To reduce the possibility of a fire or explosion, be careful when
working around gasoline or batteries.
Use only a nonflammable solvent, not gasoline, to clean parts.
Never store gasoline in an open container.
Keep all cigarettes, sparks, and flames away from the battery and all fuel-related parts.
Improper service or repairs can create an unsafe
condition that can cause your customer or others to
be seriously hurt or killed.
Follow the procedures and precautions in this man-
ual and other service materials carefully.
Failure to properly follow instructions and precau-
tions can cause you to be seriously hurt or killed.
Follow the procedures and precautions in this man-
ual carefully.
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Honda GX660 Specifications

General IconGeneral
Compression Ratio9.3:1
PTO Shaft RotationCounterclockwise (from PTO shaft side)
Ignition SystemDigital CDI with variable timing
Displacement688 cm³
Bore x Stroke78 x 72 mm
Net Power Output3, 600 rpm
Net Torque48.3 Nm (35.6 lb-ft) @ 2, 400 rpm
Fuel Consumption3, 600 rpm
Starting SystemElectric
Lubrication SystemForced lubrication

Summary

1. SPECIFICATIONS

SERIAL NUMBER LOCATION

Engine serial number location for reference and inquiries.

DIMENSIONS AND WEIGHTS SPECIFICATIONS

Specifications for engine dimensions, weights, and inclination angles.

ENGINE SPECIFICATIONS

Detailed technical specifications for engine performance, fuel, and ignition.

PERFORMANCE CURVES

Graphs illustrating engine power and torque output versus speed.

DIMENSIONAL DRAWINGS

Engine dimensional drawings with measurements for various views.

PTO DIMENSIONAL DRAWINGS

Dimensional drawings for Power Take-Off (PTO) mounting parts.

ENGINE MOUNT DIMENSIONAL DRAWING

Dimensional drawing for engine mounting configurations.

2. SERVICE INFORMATION

MAINTENANCE STANDARDS

Standard measurements and service limits for engine components.

TORQUE VALUES

Specific torque values for engine assembly and maintenance.

LUBRICATION & SEAL POINT

Locations and types of lubricants and sealants for engine parts.

TOOLS

List of special tools required for service and maintenance tasks.

HARNESS ROUTING

Illustrations showing correct routing of engine wire harnesses.

TUBE ROUTING

Diagrams detailing the correct routing of fuel and breather tubes.

3. MAINTENANCE

MAINTENANCE SCHEDULE

Periodic maintenance tasks and intervals for the engine.

ENGINE OIL LEVEL CHECK

Procedure for checking engine oil level and recommended oil types.

ENGINE OIL CHANGE

Step-by-step guide for draining and refilling engine oil.

OIL FILTER REPLACEMENT

Procedure for replacing the engine oil filter.

AIR CLEANER CHECK/CLEANING

Instructions for inspecting and cleaning the air cleaner elements.

AIR CLEANER REPLACEMENT

Procedure for replacing the air cleaner filters.

SPARK PLUG CHECK/ADJUSTMENT

How to inspect, gap, and adjust the spark plug.

SPARK PLUG REPLACEMENT

Procedure for replacing the spark plug.

SPARK ARRESTER CLEANING

Instructions for cleaning the muffler spark arrester screen.

IDLE SPEED CHECK/ADJUSTMENT

Procedure for checking and adjusting the engine idle speed.

VALVE CLEARANCE CHECK/ADJUSTMENT

Steps for checking and adjusting valve clearances.

COMBUSTION CHAMBER CLEANING

Procedure for cleaning carbon deposits from the combustion chamber.

FUEL FILTER REPLACEMENT

Instructions for replacing the fuel filter.

FUEL TUBE CHECK

Procedure for inspecting fuel tubes for deterioration or leaks.

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