HZ Cooling Fan for Honda GX610 GX620 GX670 GXV610 GXV620 GXV670 — 8.7" Direct-Fit Replacement, Includes Flywheel Nut

HZ cooling fan is a direct-fit replacement flywheel fan for Honda GX610/GX620/GX670 and GXV610/GXV620/GXV670 V-twin engines, supplying reliable airflow to keep those 18–24 HP engines running at correct operating temperatures.

If your small engine’s factory fan is damaged, warped, or missing, this HZ replacement restores the cooling airflow and engine balance without the wait and expense of OEM sourcing. Designed to match the dimensions and mounting pattern of Honda part 19511-ZJ1-000, the fan ships together with the flywheel nut for an easier swap and is compatible with a broad range of horizontal and vertical V-twin engine applications.

Will this fan fit my Honda GX620 or GX670 engine?

Yes — the HZ fan is manufactured to fit the same models as Honda part 19511-ZJ1-000. It suits GX610, GX620, GX670 and their GXV vertical counterparts across the 18HP, 20HP and 24HP ratings.

• Direct replacement for Honda 19511-ZJ1-000
• Fits GX610, GX620, GX670 and GXV610, GXV620, GXV670
• Compatible with 18HP, 20HP, 22HP and 24HP V-twin engines
• Includes flywheel nut for installation

How does the HZ fan perform compared to the original Honda part?

The HZ fan reproduces the same blade profile and mounting dimensions to provide comparable airflow and engine balance. While it is an aftermarket part, it is produced at scale for use by many small-engine manufacturers and built to withstand normal operating demands.

• Blade geometry matches OEM airflow pattern
• Balanced for smooth rotation and reduced vibration
• Durable material suited for engine temperatures and debris exposure
• Packaged with the required flywheel nut

Which equipment and non-Honda engines can use this fan?

Beyond Honda-powered equipment, the HZ fan fits a variety of machines and compatible V-twin engines that share the same mounting and dimensions. It’s commonly used in mowers, generators, compressors, and pumps that employ GX620/GX670 or similar engines from other manufacturers.

• Used on Hustler and other mower models powered by GX engines
• Compatible with certain Lifan, Loncin and Carroll Stream V-twin engines
• Works in generators, water pumps and compressors with matching flywheel fit
• Useful for restorations or field repairs when OEM stock is unavailable

How straightforward is installation and what should I check?

Installation is straightforward if you have basic mechanical skills and common tools. Confirm the fan’s outer diameter, keyway position and thread size before mounting, and torque the included nut to the engine maker’s specification.

• Verify 8.7-inch diameter and keyway alignment
• Use proper flywheel puller for removal and reinstallation
• Torque the supplied nut to manufacturer spec to prevent loosening
• Inspect for clearance to shrouds and other components after fitment

Who this is for: mechanics, landscapers, fleet managers and DIY owners who need a cost-effective, ready-to-install replacement fan for Honda 18–24 HP V-twin engines. If you maintain mowers, generators, pumps or compressors using GX610/GX620/GX670 or GXV variants and want a dependable aftermarket option that includes the flywheel nut, the HZ cooling fan is intended for your repair or rebuild projects.