YIYANTO Ignition Coil & Spark Plug Kit for John Deere Z/LA Series Mowers — MIA12788 Replacement, Direct-Fit Heat-Resistant

If your John Deere Z, LA or 100-series mower struggles to start, stalls, or idles unevenly, a worn ignition coil or spark plug is often the culprit. This replacement kit includes a high-conductivity MIA12788 ignition coil that replaces LG691060, MIA12346 and similar part numbers, plus an M78543-equivalent spark plug. It’s built for heat resistance and consistent performance so you can get back to mowing with minimal downtime.

Which John Deere models will this ignition coil fit?

This YIYANTO coil is designed to be compatible with a wide range of John Deere lawn tractors and engines across Z, LA and 100 series. It covers many common model variants used in residential and light commercial mowing.

• Compatible series: Z515E, Z525E, Z535M, Z535R, Z425, Z435, Z445 and similar Z models
• LA series: LA130, LA135, LA140, LA145, LA150, LA155
• Selected 100/series engines and E/D models including E130–E180 and D125–D170 ranges

How does this replacement kit improve starting and idle behavior?

The coil delivers stable high-voltage output while the included spark plug provides consistent ignition timing, which together reduce hard starting, misfires, and unstable idle. Both parts are inspected for conductivity and heat tolerance to maintain steady engine operation under load.

• Restores strong spark to reduce crank time and retries
• Reduces engine vibration and intermittent stalls
• Helps achieve smoother, more consistent idle speeds

Is installation something I can do myself, or do I need a mechanic?

Installation is straightforward for anyone comfortable with basic mower maintenance—no special tools or advanced electrical work required. The coil and spark plug are direct-fit replacements, so they mount and connect like the originals.

• Direct-fit replacement for listed part numbers—no modification needed
• Standard hand tools (wrench, socket) typically suffice
• Follow safety steps: disconnect battery and spark wire before removal

What should I expect from the product quality and durability?

YIYANTO builds this ignition coil with materials chosen for conductivity and thermal resistance; each unit undergoes quality checks before shipping. It’s intended to tolerate prolonged mowing sessions and the heat cycles common to small engine operation.

• Engineered for reliable conductivity and heat resistance
• Manufacturing inspections to ensure consistent performance
• Compatible spark plug selected to match ignition characteristics

Who this is for: This kit is ideal for homeowners and small-property caretakers who own compatible John Deere lawn tractors and need a cost-effective, direct replacement for a failing ignition coil or spark plug. It’s also suitable for DIY mechanics, landscape pros who perform routine maintenance, and anyone looking to reduce downtime and avoid more expensive repairs caused by ignition issues.