AUTOKAY Ignition Coil for MTD/Cub Cadet/Troy-Bilt/Craftsman 994-00128 – 547cc Engines, Direct Replacement

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

If your lawn tractor or mower won’t start or runs rough, a worn or faulty ignition coil is often the cause. The AUTOKAY 994-00128 ignition coil replaces prior part number 794-00128 and is engineered to suit a wide range of outdoor-power equipment brands including MTD, Cub Cadet, Troy-Bilt, Craftsman and others. It’s supplied as a single unit and intended for easy swap-in replacement on engines that match the listed engine codes.

Which engines and models will this ignition coil work with?

This coil fits multiple 547cc engine codes and several tractor models that use those engines. Check your engine model plate or parts diagram to confirm the engine code before ordering.

• Fits 4X90HU, 4X90HUA, 4X90HW (547cc) engine families
• Compatible with 8X90KU, 8X90KUB, 8X90ZU, 8X90ZUA series (547cc)
• Works with AX90HU, AX90HUA, AX90HUB, AX90HUC 547cc engines
• Common equipment: XT1-LT42 and XT1-LT42 C lawn tractors

How do I know this is the correct replacement part?

Confirm compatibility by matching the part number on your old coil or verifying the engine code on the engine label. The AUTOKAY unit is sold as part number 994-00128 and supersedes the earlier MPN 794-00128.

• Compare part numbers: 994-00128 replaces 794-00128
• Match your engine code to the included fitment list
• Inspect mounting points and connector style for physical fit

What are the practical benefits of replacing a faulty ignition coil?

Swapping in a new coil can restore reliable spark delivery, improving starting, idling and throttle response. It’s a targeted repair that often fixes common ignition issues without replacing larger engine components.

• Improves ignition consistency for faster starts
• Reduces misfires and uneven idling under load
• Cost-effective alternative to more extensive engine repairs

What should I expect during installation and what’s included?

Installation is typically straightforward for anyone comfortable with small-engine maintenance: disconnect the spark plug wire, remove the mounting screws, swap the coil, and reconnect. The part ships as a single ignition coil ready for installation; any gaskets, mounting hardware or additional connectors should be inspected from the original unit.

• Package contains 1 x ignition coil (994-00128)
• Standard bolt-on fit for listed engine types—verify hardware on your machine
• Follow manufacturer torque and gap specs when fitting the new coil

Who is this for? The AUTOKAY 994-00128 ignition coil is aimed at homeowners, landscapers and small-engine technicians who own or service lawn tractors and mowers powered by MTD-family 547cc engines. If your equipment is showing starting trouble, stalling, or erratic engine behavior and the engine code matches the fit list, this part is a practical, direct-replacement option to restore ignition function without full engine overhaul.