Honda GX620 LPG 2007 Owner's Manual

For the Honda GX620 LPG 2007 engine, use SAE 10W-30 oil for general use. For temperatures below 32°F (0°C), SAE 5W-30 is recommended. Always check the owner's manual for specific recommendations.
Change the oil after the first 20 hours of operation, then every 100 hours or every season, whichever comes first. Regular oil changes ensure optimal engine performance and longevity.
The correct spark plug gap for the Honda GX620 LPG 2007 engine is 0.028-0.031 inches (0.7-0.8 mm). Use a feeler gauge to check and adjust the gap as necessary.
If the engine won't start, check the fuel supply, spark plug condition, air filter, and battery charge. Ensure that the LPG supply valve is open and that there are no leaks in the system.
The recommended valve clearance for the Honda GX620 LPG engine is 0.15 mm (0.006 inches) for both intake and exhaust valves. Adjust when the engine is cold for accurate measurements.
To clean the air filter, remove the air cleaner cover and take out the filter. If it's a paper filter, gently tap it to remove dirt or replace it if it's damaged. For foam filters, wash in soapy water, rinse, and allow to dry before reinstallation.
If the engine is overheating, check for obstructions in the cooling fins, ensure proper oil level, and verify that the air intake is not clogged. Consider reducing engine load and operating in cooler conditions if possible.
For long-term storage, drain the fuel system, change the oil, clean the engine, and remove the spark plug to pour a little oil into the cylinder. Reinstall the spark plug and pull the recoil starter gently to distribute the oil. Store in a dry, clean area.
Routinely check and maintain oil levels, clean or replace the air filter, inspect and adjust spark plug gap, check valve clearance, and ensure all connections are secure. Regular maintenance ensures reliability and efficiency.
To improve fuel efficiency, ensure regular maintenance such as clean air filters and properly gapped spark plugs, operate at moderate speeds, and avoid excessive idling. Proper engine tuning and load management also contribute to better efficiency.