Ok I just back from test driving a 2000 wr 400. It has 700 miles and the original tires. The guys trustworth and drove it slowly all its life with many oil changes. Ok i get on this thing after its warmed up and it was a huge let down after riding my cr 250. It felt like i was dragging a motor home or something. I hillclimb a lot and I have to match 99 yz 250's. My question is how much does cutting the gray wire, removing muffler insert and changing to yz timing help also grinding the throttle stop. I mean at this point i'm going to go find a 426 unless you guys say those free mods are worth a $h#$ load of power. He hadn't done anything not even the throttle stop. Can u guys with wr 400s keep up with the 250cc two strokes at all. Thanks.I'm leaning to a 426 tho.