394281 394281S Primer Bulb Compatible with 394281 394281S 1501723ma Lawn Mowers

What It Is

This is a replacement primer bulb (part numbers 394281 and 394281S) for small engines on walk-behind lawn mowers, used to manually pump fuel into the carburetor before starting. It’s a common wear item on many residential and light-duty mowers.

Fitment & Compatibility

• Cross-reference: Fits OEM part numbers 394281, 394281S, and 1501723ma. Confirm your mower’s original part matches one of these.
• Brand fit: Works on many Craftsman, Husqvarna, Poulan, and MTD models (check your owner’s manual or old bulb). Not universal—verify the bulb’s stem diameter (typically ~0.25–0.3 inches) and overall height (~0.75–1 inch).
• Measurement check: Measure your old bulb’s stem length and base width. This bulb is a push-fit type; ensure the carburetor port is clean and not cracked.
• Aftermarket note: This is an aftermarket part, not OEM. It’s usually fine for most mowers, but if you need exact color or feel, OEM may be preferable.

Key Things to Know

• Quality: Users report it works well, but some note the rubber is slightly stiffer than OEM. It should last a season or two with normal use.
• Installation: Easy—usually just push out the old bulb and press this one in. No tools required. If it’s tight, use a little soapy water, not oil.
• Common gotcha: If the bulb doesn’t seat fully, or the stem is too long/short, it won’t seal. Compare stem length to your old bulb before buying.
• Price: At $7.99, it’s a cheap fix. If your mower won’t start and the bulb is cracked or hard, this is often the culprit.

Should You Buy It

Buy this if your mower uses one of the listed part numbers and the old bulb is cracked, brittle, or won’t hold prime. It’s a reliable, low-cost replacement for most Craftsman, Husqvarna, or MTD mowers—just double-check the stem size and ensure your carburetor port isn’t damaged.