Beefed Up CDI Box Replacement For Yamaha Big Bear 350 4X4 ATV YFM350FW YFM350ER 1987 1988 With Start Solenoid Relay Ignition Coil And Spark Plug Replaces Part No 1YW 85540 20 00 1YW855402000

Single-kit CDI replacement for Big Bear 350 4x4 ATV
✔️ CDI box kit with ignition coil, start solenoid, spark plug

This complete CDI box replacement kit restores ignition reliability for 1987-1988 Yamaha Big Bear 350 4x4 ATVs. It includes the CDI box, ignition coil, start solenoid relay, and spark plug, ready for a plug‑and‑play swap.

✅ Compatible with Yamaha Big Bear 4WD YFM350FWT 1987
✅ Compatible with Yamaha Big Bear 4WD-YFM350FWU 1988
✅ Compatible with Yamaha MOTO-4-YFM350ERT 1987
✅ Compatible with Yamaha MOTO-4-YFM350ERU 1988
✅ Part numbers replaced: 1YW-85540-20-00, 1YW855402000
✅ Includes: 1x CDI BOX, 1x Ignition Coil, 1x Start Solenoid Relay, 1x Spark Plug
✅ Plug-and-play installation with OEM wiring compatibility

💡 What is a CDI box replacement kit for a Yamaha Big Bear 350 4x4 and how does it improve starting and ignition?

A quick breakdown: - It replaces worn CDI components with a complete, compatible module. - It helps restore proper spark timing and reliable starts. - It uses plug-and-play wiring to minimize installation effort. - It includes parts compatible with OEM numbers 1YW-85540-20-00 and 1YW855402000.