Buckbock GX390 Ignition Coil for Honda GX240/GX270/GX340/GX390 Engines — Replacement Coil with Spark Plug Included

The Buckbock GX390 ignition coil is a drop-in replacement designed to restore reliable spark to Honda GX-series small engines and compatible portable generators.

Whether you service lawn mowers, pressure washers, or portable generators, a healthy ignition coil is essential for quick, consistent starts and steady running. This Buckbock coil is made to match the electrical output and mounting pattern of common Honda GX240–GX390 engines and a range of GP/XT/H-series generators so you can replace a failing unit with minimal fuss.

Will this ignition coil fit my Honda engine or generator?

This coil is engineered for compatibility with Honda GX240, GX270, GX340 and GX390 engines, and it also fits many GP, XT, H and RS-series portable generators. Before purchasing, confirm your engine model and the OEM part numbers to ensure proper fitment.

• Fits engines: GX240, GX270, GX340, GX390 (8–13 HP ranges)
• Compatible generators: GP5000, GP5500, GP6500, GP7500E, XT8000E and related models
• Replaces common Honda part numbers including 30500-ZF6-W01 and 30500-ZE9-L33

How will replacing the coil affect starting and engine performance?

A fresh ignition coil supplies the high-voltage pulse the spark plug needs to ignite the air/fuel mix, so swapping a weak or damaged coil typically improves cold starts and reduces misfires. It won’t alter fuel delivery or mechanical timing, but it restores the electrical side of ignition that’s crucial for stable running.

• Improves ignition voltage for stronger, more consistent sparks
• Reduces hard-starting, sputtering, and intermittent stalling
• Arrives with a replacement spark plug to simplify installation and testing

What comes in the package and what tools are needed to install it?

The kit includes one Buckbock ignition coil and one spark plug so you can perform a complete swap and bench-test the ignition quickly. Installation requires basic hand tools and moderate mechanical experience—no specialized equipment is necessary.

• Included: 1 ignition coil, 1 spark plug
• Typical tools: socket set, screwdriver, spark tester or insulated pliers
• Installation tip: disconnect the battery and ground the engine before removing the old coil

How do I confirm this is the right replacement part for my machine?

Match the part numbers stamped on your original coil or check the engine serial/model plate; cross-referencing those identifiers with the product listing prevents returns and downtime. If you’re unsure, compare mounting hole pattern and lead length to your existing unit.

• Compare OEM numbers: 30500-ZF6-W01, 30500-ZE9-L33, and related codes
• Verify physical fit: mounting slots, coil lead length, and plug boot orientation
• When in doubt, take a photo of the old coil and consult the vendor or a mechanic

Who is this for: This Buckbock ignition coil is aimed at DIY mechanics, repair shops, and equipment owners who maintain Honda GX-series engines or compatible generator models. It’s ideal if you need a reliable, cost-effective replacement to troubleshoot starting problems, eliminate intermittent misfires, or perform routine engine rebuilds without sourcing OEM units.