GX390 Air Filter Compatible with Honda GX340 GX 390 11HP 13HP Engine 17210-ZE3-505 17210-ZE3-010 Engines Lawn mowers Air Cleaner and More with spark plug

What It Is

This is a replacement air filter and spark plug combo for Honda GX340 and GX390 engines (11–13 HP), commonly used in commercial lawn mowers, pressure washers, generators, and tillers. It filters incoming air to prevent debris from damaging the engine and includes a spark plug for ignition.

Fitment & Compatibility

Check your engine’s model number (stamped on the blower housing or valve cover). This fits Honda GX340 and GX390 engines only—not GX200, GX270, or other Honda small engines. OEM part numbers are 17210-ZE3-505 (air filter) and 98079-55846 (spark plug). The air filter measures roughly 6.5 x 5 x 2 inches; measure your old filter to confirm. It will not fit non-Honda engines (e.g., Briggs & Stratton, Kohler) without adapter modifications. If your mower has a different air cleaner housing (e.g., remote mount), verify the filter shape matches.

Key Things to Know

• Quality: This is an aftermarket combo, not genuine Honda. Most users report good filtration, but some note the foam pre-filter may be slightly thinner than OEM. Replace every 100–200 hours or annually.
• Installation: Easy—remove the air cleaner cover, swap the old filter, and screw in the spark plug (torque to 18–20 ft-lbs). No special tools needed.
• Spark plug gap: The included plug is pre-gapped, but verify it’s 0.028–0.031 inches (0.7–0.8 mm) before installing. Mismatched gap can cause misfires.
• Common gotcha: The air filter may be slightly loose in the housing if your engine uses a different foam seal. Check the seal condition before buying.

Should You Buy It

Buy this if you need a quick, cheap replacement for a Honda GX340 or GX390 engine and don’t mind aftermarket quality. It’s a solid value for budget-conscious users who change filters regularly. Skip it if you require OEM durability for heavy commercial use or if your engine has a non-standard air cleaner housing.