585836101 Ignition Module Coil for Husqvarna and Ryobi Handheld Blowers

Key Features

• Precision Electronic Ignition: Engineered to provide a consistent, high-intensity spark across the entire RPM range, ensuring reliable starting and smooth engine performance.
• Optimized Ignition Mapping: Specifically calibrated for small-displacement 2-stroke blower engines, improving fuel efficiency and reducing emissions during high-speed operation.
• Weather-Shielded Encapsulation: The internal circuitry is fully potted in high-grade, heat-resistant epoxy to protect against vibration, moisture, and debris common in lawn care environments.
• Reinforced Spark Plug Lead: Features a high-tension wire with a durable silicone boot designed to resist cracking and electrical "arching" against the engine cylinder.
• Direct Bolt-On Fitment: Designed to the exact mounting specifications of the original factory module, facilitating a straightforward "drop-in" replacement without modifications.

Replaces / Cross-Reference Part Numbers

• Husqvarna: 585836101, 545108101, 5451 08 101
• Homelite / Ryobi: 300953003, 300953001, 984883001, 984882001
• Other: 850108101

Compatibility & Fitment

This ignition coil is a universal replacement for several popular handheld blower platforms. Key compatible models include:

• Husqvarna: 125B, 125BVX, 125BX (Standard and E-series models).
• Ryobi: Fits various 25cc and 26cc handheld blowers (e.g., RY08510, RY08544, RY08548).
• Homelite: Compatible with many 26cc "Blower/Vac" models (e.g., UT08514, UT08544, UT08546).
• Note: Always verify your original coil's mounting hole spacing and wire orientation, as these models occasionally used different engine suppliers.

When to Replace

• No Spark Condition: The most common failure; the engine will not start despite having fresh fuel and a clean spark plug.
• Stalling When Hot: The blower runs perfectly for 5–10 minutes but dies as the engine reaches operating temperature and won't restart until cooled (thermal failure).
• Misfiring or "Stuttering": The engine hesitates at full throttle or has an inconsistent idle, indicating the coil is struggling to maintain a steady pulse.
• Visible Insulation Damage: The spark plug wire is frayed, melted, or showing signs of being chewed by rodents, leading to a grounded ignition circuit.
• Intermittent Kill Switch Issues: If the engine refuses to shut off or dies unexpectedly, the kill switch terminal on the coil may be shorting internally.

Installation & Timing Tips

• The "Business Card" Gap: To ensure the strongest spark, the air gap between the coil legs and the flywheel magnets should be approximately 0.010" to 0.012". Use a standard business card as a gauge during installation.
• Check the Ground Path: Ensure the mounting surfaces on the engine block and the coil legs are free of rust and oil. The coil grounds through its mounting bolts; a weak ground equals a weak spark.
• Kill Switch Wiring: Be careful when attaching the small spade terminal for the stop wire. If this wire is pinched against the metal housing, the engine will never start.
• Flywheel Magnet Cleanup: While the starter cover is off, use a rag to wipe metal shavings or sap off the flywheel magnets to ensure the strongest possible magnetic induction.
• Spark Plug Health: It is highly recommended to install a fresh NGK BPMR7A (or equivalent) spark plug when replacing the coil to ensure the new module isn't stressed by a fouled plug.