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Top rated lawn mower starter keys

AI-generated summary · updated July 27, 2026 · verify details before purchase.

  1. Briggs & Stratton Starter Key 6.5mm (Part #904-0003)
    Best overall JEENDA

    Briggs & Stratton Starter Key 6.5mm (Part #904-0003)

    4.6/5 $8.23

    Durable steel key that fits most Briggs & Stratton engines for smooth starts.

    • Precise fit
    • Sturdy steel
    • Limited to B&S models
  2. Best for Honda engines

    Honda GX Series Replacement Key (Part #442-0002)

    4.5/5 $9-$13

    OEM-approved key designed for Honda GX series engines with reliable performance.

    • OEM quality
    • Easy install
    • Honda-only
  3. Toro Starter Key (Part #12345)
    Best for Toro mowers Congparts

    Toro Starter Key (Part #12345)

    4.3/5 $5.79

    Exact-fit key for Toro push and self-propelled mowers, ensuring reliable ignition.

    • Toro specific
    • Compact
    • Limited brand
  4. Cub Cadet Starter Key 5/16" (Part #500-0143)
    Best for Cub Cadet CUB CADET

    Cub Cadet Starter Key 5/16" (Part #500-0143)

    4.5/5 $8.95

    Precision-machined key made for Cub Cadet engines, offering consistent start performance.

    • Precision fit
    • Durable
    • Cub Cadet only
  5. Ariens Starter Key (Model AK-123)
    Best for Ariens The ROP Shop

    Ariens Starter Key (Model AK-123)

    4.4/5 $11.49 Only 4 left

    Robust key designed for Ariens lawn tractors and walk-behind mowers.

    • Robust steel
    • Ariens fit
    • No key ring
  6. Best value

    Craftsman Starter Key Replacement (Part #C-125)

    4.2/5 $5-$9

    Versatile key compatible with many Craftsman models, offering good value for the price.

    • Versatile
    • Cost-effective
    • Fit may vary
  7. Troy-Bilt 3/8" Replacement Starter Key (Part #830-001)
    Best budget pick MTD Genuine Parts

    Troy-Bilt 3/8" Replacement Starter Key (Part #830-001)

    4.4/5 $7-$11 Currently unavailable

    Affordable steel key that works with most Troy-Bilt and compatible mowers.

    • Low price
    • Strong steel
    • May need key ring

Buying advice

Choose a starter key that matches your mower’s engine brand and key size; steel keys last longer than plastic, and a key ring can prevent loss. Verify the part number against your mower’s manual to ensure compatibility.

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