Red 496115 694395 Primer Bulb for fits Lawn Mower 4180 5085 5085H 5085K 1 Pack

What It Is

This is a replacement primer bulb for carbureted lawn mower engines, used to manually pump fuel into the carburetor before starting. It fits specific MTD, Troy-Bilt, and Craftsman models (4180, 5085, 5085H, 5085K) and is a direct substitute for OEM part numbers 496115 and 694395.

Fitment & Compatibility

• Check your model number – This works with mowers using the 4180, 5085, 5085H, or 5085K chassis/engine series. Verify your machine’s model tag (usually under the seat or on the deck).
• OEM cross-reference – Replaces MTD 496115 and 694395. Not a universal fit; measure your old bulb’s stem diameter (typically 0.5–0.6 inches) and hole size in the carburetor cap.
• Deck size irrelevant – This is a carburetor component, so deck width doesn’t affect fitment. Focus on engine brand (Briggs & Stratton, Tecumseh, or Kohler) and carburetor type.
• Aftermarket part – Works as a budget-friendly alternative to OEM, but may have slightly softer rubber that can degrade faster with ethanol-blended fuel.

Key Things to Know

• Installation difficulty: Easy – remove the old bulb (pull straight off), push the new one onto the carburetor nipple. No tools needed.
• Common gotcha: The bulb stem must seat fully onto the carburetor port. If it’s loose, the mower won’t prime. Apply a tiny drop of oil if it’s tight.
• Durability: Expect 1–2 seasons. Red color fades in sunlight, but function remains. Avoid using fuel with high ethanol content to extend life.
• Pack quantity: 1 bulb only. Buy two if you have multiple mowers or want a backup.

Should You Buy It

If your mower won’t start because the primer bulb is cracked, sticky, or collapsed, this is a cheap, reliable fix. Perfect for DIYers with compatible MTD/Troy-Bilt/Craftsman models who want an OEM-matching part without the dealer markup. Skip it if you need a universal primer bulb or have a different engine brand.