Product: Ignition Coil replacement for Stihl MS661 / MS661C (model 1144 400 1301) Key benefits Restores reliable spark and consistent engine starts so the chainsaw runs when you need it. Exactfit design matching OEM specifications for straightforward replacement and correct alignment with the existing mounting and wiring. Durable construction with a quality plastic housing and robust internal components to resist outdoor wear and extend service life. Stable power delivery to the spark system for steady engine performance during heavy use. What this part does Functions as the ignition coil that generates the voltage pulse for the spark plug, enabling fuel ignition and engine operation. Engineered to integrate with the chainsaw's electrical system for proper timing and consistent spark strength. Compatibility and specifications Compatible with Stihl MS661 and MS661C chainsaw models. OEM reference: model 1144 400 1301. Exactfit design and electrical connections matched to factory specifications to avoid wiring changes or modifications. Materials and performance Quality plastic housing provides protection against moisture and debris while keeping the component lightweight. Internal coil and insulation designed for reliable operation under demanding outdoor conditions. Built to resist erosion and wear from vibration, heat, and exposure common in chainsaw use. Installation Plugandplay replacement designed for quick swap with no special tools or modifications. Installs in minutes for immediate functionality and stable spark delivery after mounting and connection. Practical use scenarios Onsite : a failed ignition coil in the field to get a chainsaw back to work during a job without long downtime. Seasonal maintenance: Swap in a fresh coil when preparing the saw for heavy cutting season to reduce unexpected starting issues. Equipment refurbishment: Use when rebuilding or refurbishing a used MS661 or MS661C to restore reliable ignition performance. Why choose this replacement Matches OEM fit and electrical characteristics to maintain correct performance and avoid compatibility problems. Durable materials and construction reduce the need for frequent replacements in rugged outdoor environments. Simple installation minimizes downtime and allows users to to cutting tasks quickly. Includes One ignition coil, model 1144 400 1301, compatible with MS661 and MS661C. Note Intended specifically for the listed Stihl models. Verify model compatibility before .