GCV160 Carburetor, 16620-Z8D-305 Thermo Wax for Honda HRB216 HRR216 HRS216 HRT216 HRZ216 Lawn Mower

What It Is

This is a complete carburetor assembly with an integrated thermo wax actuator (part 16620-Z8D-305) for Honda GCV160 engines. It replaces the stock carb on select Honda walk-behind mowers from the HRB216, HRR216, HRS216, HRT216, and HRZ216 series.

Fitment & Compatibility

• Engine: Fits Honda GCV160 engines only—not GCV190, GCV200, or GCV135. Check your engine model number (stamped on the blower housing).
• Mower Series: Works with HRB216, HRR216, HRS216, HRT216, and HRZ216 models. Confirm your specific mower’s deck size (e.g., HRR216VKA) using the model tag under the seat or on the frame.
• OEM vs Aftermarket: This is an OEM Honda part (genuine), not a generic aftermarket. It matches factory specs for gaskets, jetting, and thermo wax setting.
• Measurements: The carb body dimensions match the original Honda 16100-Z8D-305. The thermo wax actuator is pre-installed—no separate purchase needed.
• What else to check: Verify your old carb has the same intake flange pattern (two-bolt). Also confirm the fuel line diameter (typically 1/4-inch on these models).

Key Things to Know

• Plug-and-play for most, but not all: The carb comes fully assembled with gaskets and the thermo wax. You’ll need to remove the old carb, clean the intake manifold, and install this one with new gaskets. No jet adjustment is required.
• Thermo wax is critical: The wax actuator controls the choke and high-speed enrichment. If it fails, the engine will bog or stall. This part includes a new one, but ensure the wax rod moves freely before installing.
• Common gotcha: The fuel bowl gasket can dry out if the carb sits unused. If you store the mower for winter, drain the bowl or run it dry to prevent clogging.
• Installation difficulty: Moderate. You’ll need basic socket tools (10mm, 12mm), a screwdriver, and maybe a carburetor spring hook. Expect 20-30 minutes if you’re handy.

Should You Buy It

This is the right choice if you want a direct OEM replacement that restores factory performance without messing with rebuilds or aftermarket tuning. It’s ideal for HRB216/HRR216 owners with a GCV160 engine who need a quick, reliable fix for surging, hard starting, or stalling. Skip it if your engine is a different GCV model or you’re comfortable rebuilding your old carb (saves ~$10).