16620-Z8D-305 Thermo Wax,17211-ZL8-023 Ari Filter for Honda HRX217 GCV160 GCV190 HRR216 HRS216 GC160 GC190 Engines

What It Is

This listing bundles two separate Honda OEM service parts: the 16620-Z8D-305 Thermo Wax (choke thermostat) and the 17211-ZL8-023 Air Filter. The thermo wax controls the automatic choke on GCV/GC engines; the air filter is the standard foam element for Honda HRX, HRR, and HRS mowers.

Fitment & Compatibility

Check before buying:

• Thermo Wax (16620-Z8D-305): Fits Honda GCV160, GCV190, GC160, GC190 engines. Used on HRX217, HRR216, HRS216 series mowers. Verify your engine model (stamped on valve cover or engine shroud). Not compatible with GCV135 or GCV200.
• Air Filter (17211-ZL8-023): Fits all HRX217, HRR216, HRS216 mowers with GCV engines. Also fits some GC160/GC190 walk-behinds. Check your deck size (21" or 22") — this filter is for 21" decks. Measure your old filter: ~6.5" long x 3.5" wide x 1.5" thick.
• OEM vs Aftermarket: Both are genuine Honda parts. No cross-compatibility issues with aftermarket filters (different foam density). Thermo wax is engine-specific — no universal substitute.
• Deck size: Not a factor for these parts, but ensure your mower uses the GCV/GC engine family.

Key Things to Know

• Quality: Genuine Honda OEM — exact fit, no trimming needed. The air filter foam is denser than cheap aftermarket versions, which can cause poor sealing.
• Installation difficulty: Easy (10-15 minutes). Thermo wax: remove air filter housing, unclip old wax unit, clip in new one. Air filter: slide off old foam, slide on new, secure with retainer.
• Common gotcha: The thermo wax has a small plunger that must face the correct direction (toward the carburetor). Installing it backward prevents choke from opening. Mark orientation before removal.
• Rating note: 3.6 stars likely due to buyers receiving only one part when expecting both (this is a combined listing). Confirm the seller sends both items.

Should You Buy It

Buy this if your Honda GCV/GC mower has a stuck choke (engine floods or won’t start cold) or a clogged air filter. It’s a cost-effective OEM combo for a quick tune-up. Skip if you only need one part — the price is higher than buying separately. Right for DIY owners who want guaranteed fit without aftermarket guesswork.