I rode a friends 426 today. It did not pull nearly as hard as my 420. It didn't pull half as hard for that matter. The 400's are the baddest of the Yamaha thumpers with only about 2 grand into the engine. Basically they are the best bang for your buck. They are durable, they haul ass, and they are cheap. If anyone is thinking about buying either bike, I strongly suggest that they should buy the 400. The 426 was piped, and had some other mod's done to it that I can think of right now. The WR is the bike in my "garage", most modified on TT.