K&L Supply 20-5360 CDI Box Module - Yamaha F8T32372 CDI Boxes for ATV &#38; OFFROAD. OEM Ref. No - 4SH-85540-00-00. Make - Yamaha. Model - YFM350F Big Bear 2 &4WD&#44; YFM400FWH&#47;FWJ&#47;FWK. Year - 1997 - 1999.