So I have a (2006 frame) 400ex with no reverse. It has been rebuilt by a shop with 416 kit, new piston jug, rings, valves, seals, hotcam, new crank. And rockers. Powder coat frame, durablue axle, race hub, and lockjam. Amr cdi and coil, tag bars, kill switch, aftermarket a arms, ebc brakes, kenda kutters.... no title and have to go through the bonding process. I Found a 2004 450r with a title and he's willing to trade straight up. Has some upgrades like hmf, bars, nerfs, racing clutch, dwt aluminum rims.... checked it out today and found the carb leaks and is way stock then my 400... still ride good. what should I do? trade and build the 450? Or keep the 400 and keep building it?