Ignition Coil 4140 400 1308 for Stihl FS38 FS45 FS55 HS45 KM55 Models

Ignition coil and spark plug replacement kit with detailed installation guidance and troubleshooting tips. This kit supplies a direct-fit ignition coil and a spark plug designed to restore reliable spark and engine starting for compatible two-stroke garden power equipment. Key benefits - Restores reliable ignition and starting performance for worn or damaged ignition systems. - Reduces downtime by providing both coil and spark plug in one kit for immediate replacement. - Includes clear, step-by-step installation and troubleshooting guidance to avoid common installation errors. What is included - 1 x ignition coil. - 1 x spark plug. Manufacturer part numbers - 41401308A, 41401306A, 4140 1303A, 4140 400 1300, 4140 400 1308. Compatibility Compatible with these Stihl models: FS38, FS45, FS46, FS55, FC55, FC55 Z, FC55-DZ, HL45, HL45 Z, HS45, HS45 Z, KM55, KM55 R Z, KM55C, KM55R. The kit fits freischneiders, edgers, hedge trimmers with long reach, and motor combinations listed above. Key specifications and performance notes - Recommended flywheel air gap: 0.25 mm (0.01 inch). - Function: ignition coil provides high-voltage pulse to the spark plug; spark plug completes the ignition circuit for combustion. - Intended for two-stroke garden engines and compatible models listed above. Important installation warnings and critical checks - Correct air gap is essential. Set the gap to 0.25 mm (0.01 inch) using a thin card or feeler gauge. Too small a gap causes the coil to rub and overheat. Too large a gap results in weak or no spark. - Kill switch wiring must be intact and isolated. Disconnect the thin black kill wire and test for spark by pulling the starter rope. If spark returns after disconnecting, repair or replace the kill switch or wiring before final installation. - Use a new, clean spark plug for testing. A damaged, cracked, or fouled spark plug or a defective high-voltage boot causes leakage and will quickly damage a new coil. Replace the plug and boot if any defects or contamination are present. - Inspect the flywheel magnet. A weak, rusted, or chipped magnet reduces magnetic induction and overloads the coil. Replace the flywheel if the magnet is demagnetized or damaged. - Tighten coil mounting screws securely after setting the gap to prevent slippage during operation. Ensure the kill switch wire does not rub on sharp metal edges and that the high-voltage boot is fully seated on the spark plug. Troubleshooting checklist - Symptom: coil fires once then burns out. Action: verify flywheel gap at 0.25 mm, disconnect kill wire to rule out a short, install a new standard spark plug. - Symptom: no spark at all. Action: check kill wire and switch, confirm coil mounting and gap, test with a new spark plug, inspect flywheel magnet strength. - If problems persist after following all checks, record an installation and test video to aid further technical support. Practical use scenarios - Replace a failed ignition coil and spark plug on a FS45 hedge trimmer during seasonal maintenance to restore reliable starting and cutting performance. - Swap the coil and plug on a KM55 motor when experiencing intermittent spark or after a coil burnout caused by a shorted kill switch wire. - Install the kit on a FC55 edger during a tune-up to ensure consistent ignition and reduce the chance of in-field breakdowns. Why choose this kit - Complete replacement package with coil and spark plug for fast repair. - Includes essential part numbers for accurate cross-reference and fitment. - Detailed installation and troubleshooting steps included to help avoid the most common causes of immediate coil failure. This kit is intended for users familiar with small two-stroke engine maintenance and should be installed following the steps and checks provided to ensure correct operation.