CDI Box Replacement For Yamaha Moto 4 YFM350ER 1987 1988 Ignition Control Module 1YW-85540-20-00 OEM Replacement For ATV Quad Bike Not Compatible With 1989 And Later Big Bear Models

1x CDI Box for Moto 4 YFM350ER 1987-1988
✔️ OEM-style ignition CDI box replacement for 1987-88 Moto 4 YFM350ER

The CDI ignition box is a direct replacement electronic control module for the Yamaha Moto 4 YFM350ER, designed for 1987-1988 models. It manages spark timing and ignition control to restore reliable starting and smooth engine performance in ATV quad bikes.

✅ Replacement part number: 1YW-85540-20-00
✅ Includes 1 x Ignitor CDI Box
✅ Fits Yamaha Moto 4 YFM350ER 1987-1988; not compatible with 1989+ Big Bear
✅ Thorough factory testing before shipment

💡 What is a CDI ignition box used for in small engine ATVs? This handy module handles timing signals and ignition control for spark delivery.

- Delivers timing-accurate ignition pulses for reliable starts - Replaces faulty OEM CDI modules like 1YW-85540-20-00 on 1987-1988 Moto 4 - Improves engine response and overall ATV performance