Honda 16212-Z8B-900 Insulated Gasket Genuine Original Equipment Manufacturer (OEM) Part

What It Is

The Honda 16212-Z8B-900 Insulated Gasket is a genuine OEM replacement part that seals the carburetor-to-engine joint on select Honda small engines, preventing air leaks and stabilizing fuel mixture for proper starting and running. It’s commonly needed during carburetor cleaning, rebuild, or replacement on walk-behind mowers, pressure washers, and generators.

Fitment & Compatibility

This gasket fits only Honda GCV, GXV, and GX series engines with a specific carburetor mounting pattern—primarily GCV160, GCV190, GXV160, GXV190, and GX160 models. It is not universal. Before buying:

• Check your engine model number (stamped on the blower housing or valve cover). This gasket will not fit larger GX270, GX390, or older engines.
• Verify the carburetor type: It works with both the standard and the “easy start” carburetors on these engines.
• OEM vs. aftermarket: This is a genuine Honda part—no cross-reference to aftermarket numbers. If you see a non-Honda gasket with a similar shape, dimensions are often slightly different, risking a poor seal.
• No deck size or brand fitment: It’s engine-specific, not mower-deck or brand-specific. A Honda mower with a GCV160 engine will use it; a Toro with the same engine will too.

Key Things to Know

• Quality: Genuine Honda fiber gasket with a thin metal heat shield layer. Aftermarket copies often use paper-only material that degrades faster.
• Installation difficulty: Easy. Remove two carburetor mounting nuts, swap the old gasket, and retorque to 7–9 ft-lbs. No gasket sealant needed—the gasket is designed to seal dry.
• Common gotcha: The gasket is fragile. If you overtighten the nuts, the gasket can crush or crack, causing a vacuum leak. Use a torque wrench if possible.
• Price vs. value: At $4.95, it’s cheap enough to replace every time you service the carburetor. Reusing an old gasket often leads to hard starting or surging.

Should You Buy It

Buy this if you’re servicing a Honda GCV160–190 or GX160 engine and need a reliable seal for the carburetor. It’s a no-brainer for a $5 OEM part that prevents air leaks, rough idle, and starting issues. Skip it only if you’re working on a different engine family or have a known aftermarket gasket that fits perfectly.