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Message: [QUOTE="jescombe, post: 330537, member: 28670"] Thanks SFO, I hadn't considered the spring height, and I don't think they did. The shop re-cut the seats for Kibblewhite oversize valves, and ground the original shims to regain the correct clearance.. (Well, a vaguely correct clearance, I still had to change shims when I got it home). I think it was just a sloppy job - but you live & learn! Funnily enough, it was the Cylinder Head Shop that I had in mind for new seats. They fixed up a friends VOR head after another shop installed a valve guide off-centre. I've heard they're very busy though, so I may have a long wait.. I've just found a stock YZ400 head for £200, I'm hoping it'll fit the 426, so I may well be back in business for this weekends racing after all.. Cheers, Jon E. [/QUOTE]