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Message: [QUOTE="whenfoxforks-ruled, post: 1261397, member: 73147"] Stainless valves last a lot longer than titanium. I believe honda put them valves in to stop customers from coming in with broke rods. If your brothers head has been shimmed more than 3 sizes from stock, likely the piston is at its service limit also. And the rings went south some time ago. In my opinion the only thing the 250f has in common with the 125 is maintenance schedules. Hours on an engine is still hours of wear. [/QUOTE]