Products Description
STL MS231/MS251 Ignition Coil
High-Performance Ignition Module for STIHL MS231 & MS251 Chainsaws
The ignition coil is a critical component of the electronic ignition system on STIHL MS231, MS231C, MS251, and MS251C chainsaws . This solid-state ignition module generates the high-voltage spark required to ignite the fuel-air mixture in the engine cylinder. When the flywheel magnet passes the coil, it induces a high-voltage current that travels through the spark plug lead to ignite the fuel . A failing ignition coil typically manifests as weak spark, intermittent starting, misfiring under load, or a complete no-start condition. This replacement coil is designed to OEM specifications for reliable, long-lasting performance in demanding cutting conditions.
Technical Profiles & Materials
Precision Solid-State Design – Modern electronic ignition module without breaker points or condenser, providing more reliable spark and less maintenance than older ignition systems. Delivers consistent spark timing for smooth engine operation and easy starting in all conditions.
Wide Model Compatibility – Specifically designed for STIHL MS231, MS231C, MS251, and MS251C chainsaws . Also compatible with MS231 2-Mix, MS251 2-Mix, and MS261C models .
OEM-Spec Replacement – Replaces genuine STIHL part numbers 1143 400 1307, 1143 400 1315, 1143 400 1317, and 1140 400 1307 . Also cross-references to 1143-400-1307 and 11434001307 .
Robust Construction – Resin-encapsulated body protects electronics from vibration, dust, and moisture . Laminated steel core with copper windings ensures optimal conductivity and long service life.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 1143 400 1307 / 1143 400 1315 / 1143 400 1317 |
| 2 | Alternate Part No. | 1143-400-1307, 1140 400 1307, 11434001307 |
| 3 | Compatibility | STIHL MS231, MS231C, MS251, MS251C |
| 4 | Also Fits | MS231 2-Mix, MS251 2-Mix, MS261C |
| 5 | Ignition Type | Solid-state electronic ignition module |
| 6 | Construction | Resin-encapsulated with laminated steel core & copper windings |
| 7 | Hole Spacing | Approx. 39mm (center to center) |
| 8 | Package Includes | 1 × Ignition Coil |
Products Application
Chainsaw Engine Repair
Direct replacement for failed or failing ignition coils on STIHL MS231 and MS251 chainsaws. Restores reliable spark for easy starting and consistent operation. A defective ignition coil typically manifests as hard starting, intermittent spark, misfiring under load, or complete no-start condition.
Preventative Maintenance
When performing a full tune-up, replacing the ignition coil alongside the spark plug ensures optimal engine performance . This comprehensive service approach prevents downtime and extends chainsaw service life. The resin-encapsulated design protects electronics from vibration, dust, and moisture, making it ideal for demanding work conditions .
Professional Servicing
Suitable for workshop repairs and field maintenance. The bolt-on design allows quick replacement with basic hand tools, minimizing equipment downtime for professional users. Positioned near the engine flywheel, it works seamlessly with the existing flywheel magnet to accurately time the high-voltage spark under load .
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm this ignition coil fits my chainsaw?
A:Check your chainsaw model number on the housing. This coil fits STIHL MS231, MS231C, MS251, and MS251C models . For MS231/MS251 models, verify the serial number is after 297574503 for certain OEM variants (1143 400 1315) . Confirm your existing coil part number (1143 400 1307 or similar) for direct compatibility.
Q: What are the symptoms of a faulty ignition coil?
A: Common symptoms include hard starting, weak or intermittent spark, engine misfiring under load, sudden stalling, or complete no-start condition. A defective ignition coil will cause difficulty starting the engine and may lead to a non-start situation requiring replacement.
Q: What is included with the ignition coil?
A: Standard packages include one ignition coil . Some kits may also include spark plug and other components . Check product specifications for exact contents.
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