## The Honda GX Series Engines: Power and Performance for Demanding Applications

The Honda GX series engines are a lineup of high-performance, reliable engines designed to power a wide range of industrial and commercial equipment. From lawnmowers and generators to pumps and welders, the GX series engines deliver unmatched power, efficiency, and durability.

### Innovative Engine Design

The GX series engines are built upon Honda's renowned engineering expertise, featuring advanced engine technologies that optimize performance and reduce emissions.

- **Overhead Cam Design:** The overhead camshaft design improves combustion efficiency and reduces exhaust emissions.
- **Valve Tappet Type:** This type of valve train ensures precise valve timing and efficient engine operation.
- **Forced Lubrication System:** The forced lubrication system provides a constant flow of oil to critical engine components, reducing friction and extending engine life.
- **Centrifugal Governor:** The centrifugal governor maintains engine speed at a constant level, ensuring optimal performance under varying loads.

### Uncompromising Power

The GX series engines deliver exceptional power and torque to handle demanding workloads.

- **Honda's G-Force Engine Technology:** This advanced technology optimizes combustion and fuel efficiency, resulting in increased power and torque output.
- **High Compression Ratio:** The high compression ratio maximizes fuel efficiency and enhances engine performance.
- **Long Stroke Design:** The long stroke design provides increased torque at low engine speeds, making the engines suitable for a variety of applications.

### Exceptional Reliability

The GX series engines are built to withstand harsh operating conditions and provide long-lasting performance.

- **Cast Iron Cylinder Block:** The cast iron cylinder block provides excellent durability and heat dissipation.
- **Chrome-plated Piston Rings:** The chrome-plated piston rings minimize friction and reduce wear, extending engine life.
- **Heavy-duty Crankshaft and Connecting Rods:** The forged steel crankshaft and connecting rods provide exceptional strength and durability.
- **Advanced Cooling System:** The advanced cooling system ensures efficient heat dissipation, preventing overheating and prolonging engine life.

### User-Friendly Features

The GX series engines are designed with user-friendliness in mind, making operation and maintenance a breeze.

- **Easy Starting System:** The easy-starting system includes a recoil starter and automatic decompression system, making starting the engine a simple task.
- **Low Noise and Vibration:** Advanced noise reduction technologies minimize engine noise and vibration, reducing operator fatigue and improving work environments.
- **Simple Maintenance:** Accessible oil fill and drain points, as well as easy-to-replace spark plugs and air filters, facilitate regular maintenance and reduce downtime.

With its superior power, reliability, and user-friendly features, the Honda GX series engines are the ideal choice for powering a wide range of industrial and commercial equipment. From construction sites to agricultural fields, the GX series engines provide dependable performance and unmatched durability to meet the demands of even the most challenging applications.

HONDA GX240 GX270 GX340 GX390 ENGINE WORKSHOP SERVICE REPAIR MANUAL


THIS MANUAL IS COMPATIBLE WITH THE FOLLOWING COMPUTER OPERATING SYSTEMS:

# ALL WINDOWS VERSION
# ALL MAC VERSION

# YOU NEED THE ADOBE ACROBAT READER TO VIEW THE DOCUMENT AS THE MANUAL IS PDF FORMAT. IF YOUR COMPUTER DON'T HAVE THIS APPLICATION YOU CAN DOWNLOAD AND INSTALL IT FREE FROM ADOBE ACROBAT WEBSITE

# AS THIS MANUAL IS COMING TO YOU IN ZIP FORMAT, YOU NEED TO EXTRACT THE FILE BEFORE USE BY USING WINZIP OR WINRAR SOFTWARE. IF YOUR COMPUTER DON'T HAVE THIS APPLICATION YOU CAN DOWNLOAD AND INSTALL IT FREE FROM WINZIP WEBSITE



APPLICABLE ENGINE MODEL:
HONDA GX240K1, GX270, GX340K1, GX390K1 ENGINE


ENGINE COVERED:
242 cc 1-CYLINDER, 4-STROKE, AIR-COOLED, OHV, GX240K1 ENGINE
270 cc 1-CYLINDER, 4-STROKE, AIR-COOLED, OHV, GX270 ENGINE
337 cc 1-CYLINDER, 4-STROKE, AIR-COOLED, OHV, GX340K1 ENGINE
389 cc 1-CYLINDER, 4-STROKE, AIR-COOLED, OHV, GX390K1 ENGINE



CONTENTS:
SPECIFICATION
SERVICE INFORMATION
MAINTENANCE
AIR CLEANER SYSTEM
MUFFLER SYSTEM
RECOIL STARTER
FAN COVER SYSTEM
CARBURETOR SYSTEM
FUEL TANK
GOVERNOR ARM
CONTROL BASE SYSTEM
FLYWHEEL SYSTEM
IGNITION COIL
STARTER MOTOR
CYLINDER HEAD-VALVES
CRANKCASE-GOVERNOR
CRANKSHAFT & PISTON
REDUCTION UNIT
OPTIONAL PARTS
INDEX



THIS MANUAL PRESENTED FOR YOU IN ELECTRONIC FORMAT YOU CAN JUST PRINT OUT THE PAGE YOU NEED THEN DISPOSE OF IT WHEN YOU HAVE COMPLETED YOUR TASK. THIS MANUAL HAS DETAILED ILLUSTRATIONS AS WELL AS STEP BY STEP WRITTEN INSTRUCTIONS WITH THE NECESSARY DIAGRAMS OR PICTURES. THESE MANUALS ARE YOUR NUMBER ONE SOURCE FOR REPAIR AND SERVICE INFORMATION & SPECIFICALLY WRITTEN FOR THE DO-IT-YOURSELF AS WELL AS THE EXPERIENCED MECHANICS WORLDWIDE USED TO USE THIS FACTORY MANUAL TO FIX YOUR ENGINE. USING THIS REPAIR MANUAL IS AN INEXPENSIVE WAY TO KEEP YOUR ENGINE WORKING PROPERLY. IT IS THIS LEVEL OF DETAIL, ALONG WITH ILLUSTRATED, THAT GUIDE THE READER THROUGH EACH SERVICE, REPAIR & MAINTENANCE PROCEDURE.


I ALSO HAVE LOTS OF MANUAL WHICH ARE NOT ADVERTISED IN MY STORE, IF YOU NOT FOUND YOUR DESIRED MANUAL IN MY STORE, PLEASE MASSAGE ME AND I WILL TRY MY BEST TO PROVIDE YOU THAT MANUAL.