HZ Ignition Coil replacement for Briggs & Stratton 594626 — fits 9–21 HP mowers, direct-fit high-voltage spark module

The HZ Ignition Coil 594626 is a direct-fit replacement ignition module engineered to restore spark and reliable starting for many Briggs & Stratton and compatible small engine models.

Built to industry-fit dimensions and electrical specs, this HZ coil replaces part numbers such as 594626, 594456, 595304, 799650, 795315, 592841, 595038 and others used across Briggs & Stratton, MTD, John Deere and select OEM lawn and garden equipment. It’s designed for a wide range of horizontal-shaft engines from roughly 9–21 horsepower commonly found in walk-behind mowers, riding mowers, and other outdoor power tools. The following details explain how this coil performs, which engines and models it supports, and practical installation considerations.

Which engine models and part numbers will this HZ coil replace?

This coil is manufactured to match the mounting, lead configuration, and output typical of the Briggs & Stratton parts listed in compatible catalogs. It covers many OEM part numbers and a variety of engine families used by brands like MTD, Troy-Bilt, Cub Cadet, Craftsman, Husqvarna and John Deere.

• Directly compatible with Briggs & Stratton numbers: 594626, 594456, 595304, 799650, 795315, 592841, 595038.
• Also fits OEM cross-references such as 492341, 490586, 495859, 690248, 715231 and John Deere LG492341, LG495859.
• Used across engine families from ~9 hp up to ~21 hp including common mower engine model codes.

How does this coil affect mower starting and engine performance?

Replacing a faulty coil restores high-voltage spark delivery to the spark plug, which improves cold starts, steady idling, and throttle response. While it won’t change underlying mechanical issues, a properly functioning coil is essential for consistent ignition and smoother operation.

• Delivers consistent high-voltage output to re-establish reliable spark.
• Reduces misfires and hard-start conditions when installed correctly.
• Works with existing rotor, flywheel, and spark plug setups—no ECU reprogramming required.

Is installation straightforward for a DIY mechanic?

Yes—installation is typically a moderate DIY task for anyone comfortable removing a flywheel shroud and working with basic hand tools. Observe standard safety steps: disconnect spark plug, note gap and lead routing, and torque fasteners to factory specs.

• Remove shroud and flywheel as needed to access coil mounting screws and leads.
• Set and verify air gap per engine spec before final tightening for reliable performance.
• Reconnect kill wire and spark lead exactly as routed to ensure proper grounding and operation.

What outbound compatibility should I verify before ordering?

Confirm your engine’s model code or existing coil part number to ensure a match. Check physical mounting hole spacing, terminal/lead types, and required air gap to avoid fitment issues during installation.

• Compare your old coil’s part number and connector style to the HZ listing.
• Verify mounting hole pattern and whether a separate condenser is used on your engine.
• Measure or reference the factory air gap specification for final setup after installation.

Who is this for: The HZ Ignition Coil 594626 is aimed at DIY owners, landscapers, and small-engine repair shops needing a dependable replacement for failed or weak ignition coils on Briggs & Stratton and cross-referenced OEM engines. It’s a practical choice for anyone restoring spark to walk-behind mowers, zero-turns, and similar equipment that uses the listed part numbers and engine families.