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General| Displacement | 389 cm³ |
|---|---|
| Bore x Stroke | 88 mm x 64 mm |
| Compression Ratio | 8.2:1 |
| PTO Shaft Rotation | Counterclockwise (from PTO shaft side) |
| Ignition System | Transistorized magneto ignition |
| Oil Capacity | 1.1 L (1.2 US qt) |
| Fuel System | Carburetor |
| Engine Type | Air-cooled 4-stroke OHV |
| Starting System | Recoil starter or electric starter (optional) |
| Fuel Tank Capacity | 6.1 liters (1.61 US gal) |
Explains safety signal words and their meanings for user awareness.
Covers essential safety precautions, common hazards, and owner responsibilities for safe engine use.
Identifies engine components and controls through visual diagrams for user orientation.
Details the function and operation of various engine controls like the fuel valve.
Explains the operation of engine switches, choke levers, throttle levers, and recoil starter grips.
Describes specific engine features such as the Oil Alert® system and circuit breaker.
Guides users through essential pre-operation checks to ensure the engine is safe and ready for use.
Provides critical safety guidelines and warnings to follow before and during engine operation.
Step-by-step instructions for starting the engine, covering both cold and warm engine procedures.
Details the correct procedures for safely stopping the engine in normal and emergency situations.
Explains how to adjust the throttle lever to achieve the desired engine speed.
Emphasizes the necessity of regular maintenance for engine safety, efficiency, and longevity.
Outlines crucial safety practices to follow during maintenance and repair activities.
Presents a detailed schedule of recommended maintenance tasks and their intervals.
Provides instructions and safety precautions for refueling the engine with gasoline.
Specifies the recommended type of unleaded gasoline for optimal engine performance.
Guides users on how to check the engine oil level to prevent damage.
Explains the process of changing the engine oil, including proper disposal.
Advises on selecting the correct engine oil viscosity based on ambient temperature.
Details how to check the transmission oil level for specific engine models.
Provides instructions for changing the transmission oil in applicable engine types.
Explains how to inspect air filter elements and identify different types.
Covers service procedures for dual-filter-element air cleaner types.
Provides service instructions for oil-bath and single-filter air cleaner configurations.
Details the cleaning and maintenance procedures for low profile air cleaner elements.
Instructions for cleaning the fuel sediment cup to ensure fuel system integrity.
Guide to inspecting, gap adjustment, and replacement of spark plugs.
Step-by-step guide to adjusting the engine's idle speed for optimal performance.
Instructions for servicing the spark arrester, including cleaning and replacement.
Procedures for preparing the engine for storage, including cleaning and fuel management.
How to use fuel stabilizers to prevent fuel deterioration during extended storage periods.
Steps for completely draining the fuel system for long-term storage.
Advice on selecting a suitable storage environment and protecting the engine from damage.
Guidance on preparing the engine for use after a period of storage.
Instructions for safely transporting the engine, focusing on cooling and preventing leaks.
Troubleshooting guide for an engine that fails to start, listing causes and solutions.
Procedures for replacing a blown fuse in electric starter and charging circuits.
Shows the location of the engine's serial and type number for identification.
Step-by-step guide for correctly connecting a 12-volt battery to the electric starter system.
Illustrates installation methods for remote throttle and choke control linkages.
Explains carburetor adjustments needed for optimal engine performance at high altitudes.
Discusses the use of oxygenated fuels and potential impacts on engine performance and system integrity.
Information regarding emission sources, regulations, and the prohibition of tampering.
Lists engine symptoms that may indicate issues with the emission control system.
Explains the Air Index label related to emission durability periods for engines.
Provides detailed technical specifications for the GX240/GX270 and GX340/GX390 engine models.
Lists key tune-up specifications including spark plug gap and idle speed.
Presents electrical wiring diagrams for different engine configurations.
Lists additional manuals and catalogs available from Honda for maintenance and parts.
Information on how to obtain warranty service and contact customer support.
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