Compatible with series engines: This ignition coil set is designed for 610, 620, and 670 V twin engines, compatible with 18HP, 20HP, and 24HP models. Direct replacement parts: Replaces part numbers 30500 ZJ1 845, 30500 ZJ1 023, and 30500 ZJ1 013 for straightforward installation without modifications. Comprehensive replacement set: Includes both left and right ignition coils in one , providing everything needed for complete replacement. Enhanced engine performance: Expect improved performance and smoother operation with better fuel efficiency for reliable power output. Use scenarios Routine maintenance on equipment with 610, 620, or 670 V twin engines such as 18HP, 20HP, or 24HP models to prevent coil failure and maintain consistent performance. Replacing failed or worn ignition coils on older engines to restore smooth idle, reliable starting, and stable power delivery. Upgrading a fleet of small engines to improve throttle response and fuel efficiency, reducing downtime and maintenance needs.