AUTOKAY Ignition Coil 994-00128 for 547cc MTD/Cub Cadet/Troy-Bilt Engines — Direct-Fit Replacement, Restores Spark

AUTOKAY 994-00128 ignition coil is a direct-fit replacement designed to restore spark performance on compatible MTD-family 547cc lawn tractor engines.

If your lawn tractor, zero-turn, or riding mower with a 547cc engine is misfiring, hard to start, or losing power, a worn ignition coil is a common culprit. The AUTOKAY 994-00128 (replacement for prior MPN 794-00128) provides the same mounting footprint, connector positions, and electrical output as original equipment for many MTD, Cub Cadet, Troy-Bilt, Craftsman, Bolens, Remington, Ryobi, Yardman, Yard Machine, and Huskee models.

Which machines and engines will this coil fit?

This ignition coil was built to match the factory specifications used across multiple 547cc engines and select mower models. It fits an array of engine codes and specific models, so you can confirm compatibility by checking the part number and engine stamping before purchase.

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

How will swapping to this ignition coil affect my mower's performance?

Replacing a failing coil with a properly matched unit like the AUTOKAY 994-00128 typically returns reliable spark timing and voltage to the engine, improving starting, idle stability, and throttle response. It does not change tuning or emissions; it restores the electrical ignition function the original part provided.

• Restores consistent spark for better cranking and starting.
• Improves idle smoothness and reduces intermittent stalling.
• Helps maintain engine power under load compared to a weakened coil.

What comes in the package and what do I need for installation?

The package includes one ignition coil ready to install. Installation typically requires basic hand tools and a few minutes of mechanical knowledge—no special equipment is necessary, but a service manual or online diagram helps ensure correct gap and alignment.

• Package contents: 1x AUTOKAY 994-00128 ignition coil.
• Tools commonly needed: socket set, screwdrivers, feeler gauge for air gap adjustment, and ignition wire pliers.
• Recommended check: confirm coil air gap and secure ground connections during installation.

How can I verify this part is the right replacement before ordering?

Match the part number stamped on your old coil with 994-00128 or the prior MPN 794-00128, and compare the engine code on your mower to the supported list. Visual comparison of mounting holes, connector type, and spark plug lead routing will also help avoid returns.

• Inspect your old coil for part numbers and mounting orientation.
• Confirm your mower’s engine code is among the listed 547cc variants.
• Use photos or service manual schematics to compare connector and bracket positions.

Who is this for: The AUTOKAY 994-00128 ignition coil is intended for owners and technicians servicing small tractors and mowers powered by the specified 547cc MTD-family engines. It’s suitable for DIY mechanics replacing a faulty ignition coil and professional shops seeking an affordable, compatible replacement that matches factory fit and function.