Was checking valve clearance last night and noticed that the shims on the exhaust valves were sitting below the retainers on cylinder #2.

So looks like the keeper groove has worn an i'll be needing some new valves!

At 38 pounds each from Robinson Foundry, I figured might as well look into some light weight racing valves, does anyone know of anywhere that does them for the GSXR400? If not anyone have detailed dimensions of the valves(stripes1976) so I can get Ferrea to custom make some valves?

TIA

i had a set made but the standard retainers didn't hold. So then had a second set made with a different retainer and collar. This worked but at a hell of an expense. If i was you i'd stick to the robinsons price as i think mine ended up nearly £900