AUTOKAY Ignition Coil for 547cc MTD Engines — 994-00128 Direct-Fit Replacement, Single Unit

AUTOKAY 994-00128 is a replacement ignition coil designed to restore spark delivery for compatible 547cc MTD-family engines and select garden tractors.

If your lawn tractor or mower with a 547cc engine is hard to start, backfires, or stalls, a faulty ignition coil is a common cause. This direct-fit AUTOKAY part (994-00128, replaces prior MPN 794-00128) is built to match the original equipment's mounting and electrical connections so you can return performance without modifying the engine. The coil ships as a single unit ready to install on models from MTD, Cub Cadet, Troy-Bilt, Craftsman and other brands that share the listed engine codes.

Which machines and engines does this coil fit?

This coil fits a range of 547cc engines and multiple mower models that use the same ignition architecture. Confirm your engine code or part number before ordering to ensure compatibility.

• Compatible brands: MTD, Cub Cadet, Troy-Bilt, Craftsman, Bolens, Remington, Ryobi, Yardman, Yard Machine, Huskee.
• Engine codes: 4X90HU, 4X90HUA, 4X90HW, 8X90KU, 8X90KUB, 8X90ZU, 8X90ZUA, AX90HU, AX90HUA, AX90HUB, AX90HUC (547cc).
• Vehicle models: includes XT1-LT42 and XT1-LT42 C tractors among others sharing these engines.
• Part cross-reference: AUTOKAY 994-00128 replaces prior MPN 794-00128.

How will installing this ignition coil affect starting and running?

Replacing a worn or damaged coil typically improves spark consistency, which helps the engine start easier and run smoother under load. You should notice fewer misfires, reduced stalling, and more reliable ignition timing once the coil is correctly mounted and connected.

• Restores reliable high-voltage spark to the spark plug.
• Reduces hard-start conditions and misfires when faulty coil was the issue.
• Works with factory wiring and mounting points for straightforward replacement.

What should I check before replacing the coil?

Verify the part number and engine code to confirm fitment, and inspect surrounding components to rule out other causes of ignition failure. Basic checks save time and ensure the new coil fixes the problem rather than masking unrelated issues.

• Match OEM part numbers: 994-00128 (replacement for 794-00128).
• Confirm your engine code from the engine label or manual (see list above).
• Inspect spark plug, plug wire, flywheel key, and wiring harness for damage before installation.

How difficult is the installation and what comes in the package?

Installation is generally straightforward for anyone comfortable with small-engine maintenance; basic hand tools are usually sufficient. AUTOKAY supplies one ignition coil per package; fasteners and spark plug wire may be reused if undamaged.

• Package contents: 1x ignition coil (AUTOKAY 994-00128).
• Tools typically required: socket/ratchet, screwdriver, and spark plug boot puller or pliers.
• Follow proper gap and mounting torque per your engine service manual for best results.

Who this is for: This ignition coil is suited for do-it-yourself lawn tractor owners, small-engine technicians, and fleet maintainers who service MTD-family 547cc engines across Cub Cadet, Troy-Bilt, Craftsman and similar brands. Choose this OEM-replacement style coil when you need a direct-fit part to restore reliable ignition without custom wiring or modifications.