The owner’s manual provides detailed, illustrated instructions on how to operate and maintain the engine to ensure peak performance all the time.
Make sure you have the proper weight of oil to ensure a long life. SAE 10W-40 is the recommendation for general, all-temperature use. Always check the oil level before using.
Fuel and fuel safety
Make sure you have the correct fuel to prevent serious damage to the engine. Gasoline having an octane number of 86 or higher is recommended. Since gasoline is flammable and its vapors are dangerous, be very careful of spills and do not inhale the fumes. Make sure that you do run the engine where there it is well-ventilated to prevent long exposure to its exhaust fumes as carbon monoxide is produced which can be fatal if inhaled.
Check the air cleaner elements to ensure they are clean and in good repair. When you start the engine, allow it to warm up for a few minutes before operating it. Follow the recommended maintenance procedures as displayed in the owner’s manual, and your engine will provide years of service for you.
Where to find replacement parts and more information
If you have any additional questions or need replacement OEM parts for your GX120, head over to hondalawnparts.com. Our staff will gladly assist you with troubleshooting and part recommendations. We ship across the U.S. and Canada. We have hundreds of articles on our blog for additional information about Honda parts, products, and services.