My buddy's WR426 has been a little hard to start lately so I checked the valves and the center intake is toast. All the others are good. I started looking into parts. One stock Ti intake is over $100. I noticed that Kibblewhite lists the same valve for 98 - 02 in stainless which got me thinking can you use the stock stainless valves for the 400 in a 426? The stock SS valve is only $15. If I replace all the valves, springs and seals with ss I'm only into it about $150 + getting the seats cut. He's a weekend play rider and is not hard on the bike so I'm thinking stainless might be the ticket. I'm going to tear the head down tomorrow and see what's up. Anybody try this before?