Stens 120-440 1 Primer Bulb Replaces Lawn-Boy 66-7460 and Toro 66-7460 | Replaces Lawn-Boy 66-7460, Replaces Toro 66-7460

What It Is

The Stens 120-440 is an aftermarket primer bulb that replaces OEM part numbers Lawn-Boy 66-7460 and Toro 66-7460. It’s used on push mowers, trimmers, and blowers with a primer bulb assembly that primes the carburetor for cold starts.

Fitment & Compatibility

• Direct replacements: Lawn-Boy 66-7460, Toro 66-7460. Also fits many Stens, Oregon, and generic aftermarket carburetor assemblies.
• Check before buying: Measure the bulb’s outside diameter (approx. 0.9 in / 23 mm) and the nipple diameter (about 0.2 in / 5 mm). Verify your mower’s model number (e.g., Lawn-Boy 10600 series, Toro Recycler 200 series) against the OEM part cross-reference. Not compatible with self-priming or fuel-pump-style systems.
• Deck size irrelevant — this part fits the carburetor, not the deck. Confirm the carburetor has a removable primer bulb assembly (not a sealed unit).

Key Things to Know

• Quality: Stens is a reputable aftermarket brand; this bulb is slightly stiffer than OEM but seals well and lasts 2-3 seasons in normal use.
• Installation: Push the nipple firmly into the carburetor body until it seats flush. No tools required, but ensure the bulb isn’t twisted or kinked.
• Gotchas: If the old bulb’s nipple broke off inside the carburetor, you may need to remove the carb to extract the piece. Also, a cracked fuel line or dirty carburetor can mimic a bad primer bulb — check for fuel flow before replacing.
• No gasket included: Reuse the old plastic retainer ring or gasket if present; if missing, order a separate carburetor gasket kit.

Should You Buy It

Yes — if your mower’s primer bulb is cracked, hardened, or not rebounding, this is a cheap, easy fix. It’s right for DIYers who want a drop-in replacement without paying OEM markup. Avoid if your carburetor has a sealed primer system (no removable bulb) or if the fuel system has deeper issues like a clogged jet.