Hi guys. Just signed up today as i found this place to be the best for info on the WR series. I've just bought a non-running wr400 (1999) which doesnt have a piston/head as it dropped a valve and the guy has since sold it on. Im struggling to find a wr400 barrel/cylinder head in the UK, and i was wondering if the YZ 400 head/barrel were the same? Thanks Ross.