TGGKKPARTS Spark Plug Wire Kit for John Deere 825i & 825i S4 — 3‑Piece Copper Core with Silicone Jacket

TGGKKPARTS spark plug wire kit is a three-piece copper-core replacement set designed to restore reliable ignition for John Deere 825i and 825i S4 models.

If your John Deere 825i or 825i S4 is showing signs of misfires, weak starts, or reduced throttle response, worn ignition wires are a common, serviceable cause. This kit includes three precisely measured wires—one 13.5", one 10", and one 8"—matching cylinders #1, #2 and #3 so you can replace only the faulty lines and retain correct routing. Built with a copper conductor and a heavy-duty silicone sleeve, these wires are engineered to maintain high voltage delivery while resisting heat, moisture and chemicals normally found under the hood.

How will these wires affect my engine’s ignition performance?

Fresh ignition wires deliver a stronger, cleaner spark by reducing energy loss between the coil and spark plug. The copper core offers low resistance for efficient voltage transfer while the spiral winding design helps suppress interference. Together they support consistent combustion and smoother running.

• Copper-core conductor for low electrical resistance
• Optimized lengths for proper cylinder routing
• Spiral winding and insulation that minimize signal leakage

What makes the TGGKKPARTS wires durable in a tractor environment?

Durability comes from materials selected to withstand heat, oil, moisture and chemical exposure common in agricultural machinery. The heavy-duty silicone outer sleeve shields the internal winding core from degradation while corrosion-resistant components extend service life. These design choices reduce the chance of shorts, cracks or premature failure.

• High-temperature silicone jacket resists cracking and melting
• Materials chosen for corrosion and chemical resistance
• Construction targeted at long-term outdoor and heavy-use conditions

Which models and parts do these wires replace, and what’s included?

This kit is shaped specifically for John Deere 825i and 825i S4 models and corresponds to part numbers MIA11722, MIA11723 and MIA11724. The set includes one wire for each cylinder with exact lengths listed so installations are straightforward and routing stays correct. It’s intended as a direct-fit replacement for the three-wire ignition layout on those models.

• Compatible with John Deere 825i and 825i S4
• Includes: 1 x MIA11722 (13.5" for Cylinder #1), 1 x MIA11723 (10" for Cylinder #2), 1 x MIA11724 (8" for Cylinder #3)
• Design aligns with factory cylinder locations for easy installation

How do I install and maintain these spark plug wires?

Installation is a basic maintenance task: remove one old wire at a time to avoid misrouting, fit the new wire to the spark plug and coil or boot, and secure any retainers. Periodic inspection for cracks, loose boots or corrosion will help you catch wear before performance drops. Use dielectric grease on boots if recommended by your service guidance to aid connection and reduce moisture intrusion.

• Replace wires one at a time to preserve firing order
• Check boots and terminals for tight fit and corrosion
• Inspect regularly and clean engine area of oil/grease buildup

Who is this for: This TGGKKPARTS three-piece spark plug wire kit is aimed at John Deere 825i and 825i S4 owners, do-it-yourself mechanics, and small-farm technicians who need a direct-fit, durable replacement to restore proper ignition. If you want a cost-effective repair that targets misfires, rough idling or unreliable starts without replacing the entire ignition system, these copper-core wires provide a practical, vehicle-specific solution.