Headstock Bearings and Seals: Yamaha WR400 WR 400 (1998-2002) Honda SJ50 then it's probably your coil

then it's probably your coil that's knackered

This set of head stock bearings are taper roller style and have been manufactured to replace the original set of steering bearings on a Honda CB450 for the years and models shown above

To upgrade OEM: 30506-MA6-003

If you have a weak spark on your Kawasaki ZRX1200 then the coils could be the culprit and it's a good idea to get some new coils on the bike

Headstock Bearings and Seals: Yamaha WR400 WR 400 (1998-2002) Honda SJ50 then it's probably your coilBrand new set of headstock steering bearings and seals to fit: Yamaha WR 400 F (1998 2002). This set of head stock bearings are taper roller style and have been manufactured to replace the original set of steering bearings on a Yamaha WR400 for the years and models shown above. Top sized: 28mm x 52mm x 16mm. Bottom sized: 30mm x 52mm x 16mm. All sizes set out ID x OD x Thickness. The seals are not included in the measurements. If you require different