I'm looking for a new bike because I just sold my Cr 250. I live on a ranch and want something to drive daily in the summer. I'm looking around at wr 400's and 426. funds are limited to like 2500 bucks so i'm trying to find a good deal. I really didn't think there were many big changes in the wr 400s, but 1. are there any years I should look out for. 2. How long can a 400 go before a rebuild. and what does a rebuild cost and entail? New piston, rings, pin, cam chain? How long do valve guides and valves last in these beasts? I am extremely mechanical so most of the work will be done by myself saving honing and valve seat work. 3. does the wrf have nicasil cylinders or are they sleeves? 4 when rebuilding is it usually necessary to renicasil or just hone. When i rebuild my kdx i got a way with no renic. I want something for trail and extreme hill climbing in the badlands( gumbo from hell). An xr just wouldn't cut it. stability is probably one of the big things as my cr was like riding a lob sided rocked filled with nitro. I'm looking forward to participating in these formums and any help would be greatly appreciated, Thanks.