YAMAKATO ignition coil magneto armature replacement kit for Briggs & Stratton 17.5hp — includes K5RTC spark plug & air-gap gauge

YAMAKATO 595304 ignition coil magneto armature is an aftermarket replacement assembly—including coil, K5RTC spark plug, and air-gap gauge—designed to restore spark generation on compatible Briggs & Stratton 17.5hp small engines.

If your walk-behind mower or lawn tractor has a failed magneto or weak spark, this replacement kit gives you the core components needed to get the ignition system back to working order. The assembly carries part numbers 595304, 799650 and 795315 and fits a selection of engines from Briggs & Stratton and common OEMs such as MTD, Cub Cadet, Troy-Bilt, John Deere L110 (with BS 17.5hp), and Craftsman LT1000. Note: this is an aftermarket component—verify compatibility and warranty/CARB needs with your equipment manufacturer before installing.

How does this coil assembly replace a worn magneto?

The YAMAKATO unit replaces the damaged armature and coil that generate the high-voltage pulse for the spark plug. Installation restores ignition timing and pulse strength when the original magneto no longer provides reliable spark. Always compare mounting holes, flywheel clearance and electrical connector types before swapping parts.

• Includes complete coil assembly to match OEM mounting points.
• Supplied with K5RTC spark plug to ensure proper plug gap and fit.
• Air-gap gauge provided to set precise coil-to-flywheel clearance.

Which machines and engines are compatible with this part?

This aftermarket armature is compatible with about 30% of Briggs & Stratton 17.5hp small engines and several popular OEM models. It’s commonly used in MTD-built walk-behind mowers and selected John Deere and Craftsman lawn tractors. Use the product images and part numbers to confirm a match before purchase.

• Part numbers: 595304, 799650, 795315 for cross-reference.
• Fits many MTD, Cub Cadet and Troy-Bilt self-propelled mowers.
• Fits John Deere L110 when equipped with a BS 17.5hp engine and Craftsman LT1000 in certain configurations.

What comes in the box and what tools will I need?

The package contains the coil assembly, one K5RTC spark plug, and an air-gap gauge to help set the correct clearance. Basic hand tools and engine-specific removal steps are required, including flywheel access. Follow the engine manufacturer’s service guide for torque specs and safety precautions.

• Included: coil assy, K5RTC spark plug, air gap gauge.
• Typical tools: socket set, flywheel puller (if applicable), feeler gauge, torque wrench.
• Preparation: disconnect battery/fuel and follow ignition safety procedures.

How do I ensure correct installation and performance?

Proper air-gap, secure mounting, and a correctly gapped spark plug are critical for reliable ignition. Use the included gauge to set the coil-to-flywheel space and tighten mounting bolts to recommended torque. If you’re unsure, have a qualified small-engine technician confirm fit and tune.

• Measure and set air gap per guide; re-check after the first run.
• Inspect flywheel key and timing marks before reassembly.
• Replace any worn wiring, connectors or ignition switch components interfering with output.

Who is this for: This YAMAKATO ignition coil magneto armature kit is aimed at DIY mechanics, small-engine repair shops, and owners of older walk-behind mowers or lawn tractors that use Briggs & Stratton 17.5hp engines or matching OEM models. It’s suitable when the original magneto has failed or produces weak spark, and when you can verify compatibility using the listed part numbers and physical mounting points. As an aftermarket replacement, confirm vehicle warranty and any emissions (CARB) requirements before installation.