John Deere Original Equipment Spark Plug #MIU11020

What It Is

The John Deere Original Equipment Spark Plug #MIU11020 is a direct-replacement ignition plug designed for select John Deere lawn tractors, zero-turn mowers, and riding mowers with small engines (typically Briggs & Stratton or Kawasaki). It ensures reliable starting and efficient combustion in residential or light-commercial mowing.

Fitment & Compatibility

Before buying, check your machine’s model number and engine type. This plug fits many John Deere models including the D100, D105, D110, D120, D125, D130, D140, D150, D155, D160, D170, D175, X300, X304, X310, X320, X324, X330, X340, X350, X360, X370, X380, X390, Z225, Z235, Z245, Z255, Z335E, Z345R, Z355R, Z375R, Z395R, Z510A, Z520A, Z530A, Z540A, Z545R, Z560A, Z565R, Z570A, Z575R, Z645, Z665, Z710A, Z720A, Z730A, Z740A, Z745R, Z760A, Z765R, Z770A, Z775R, Z795R, Z810A, Z820A, Z830A, Z840A, Z850A, Z860A, Z870A, Z880A, Z890A, Z910A, Z915E, Z920A, Z925A, Z930A, Z940A, Z950A, Z960A, Z970A, Z980A, Z990A, and more. Verify your engine spec—this plug is for 14mm thread, 3/4” reach, 5/8” hex, and a gap of 0.030” (pre-gapped, but always confirm). If your mower uses a different plug (e.g., Champion RC12YC), cross-reference the OEM part number. Aftermarket equivalents exist (e.g., NGK BPR5ES), but this is the genuine John Deere part.

Key Things to Buy

• Quality: OEM construction ensures proper heat range and electrode material for consistent spark and longer life. Avoid cheap knockoffs that may cause misfires.
• Installation: Easy DIY job—remove the spark plug wire, unscrew the old plug with a 5/8” socket, gap the new one to 0.030” if needed, hand-tighten, then torque to 15–20 ft-lbs. Over-tightening can strip the threads.
• Common Gotchas: The plug is pre-gapped, but always check with a feeler gauge as shipping can shift the gap. If your engine is hard to start or runs rough, a fouled or worn plug is often the culprit—replace annually or every 100 hours.
• Storage: Keep the plug dry and in its original packaging until use. Moisture can cause corrosion.

Should You Buy It

Yes, if you own a compatible John Deere mower and want a hassle-free, exact-fit replacement that maintains factory performance and reliability. It’s a no-brainer for routine maintenance—skip the guesswork of