I've had this '98 KDX220 for a few weeks, but I've only had it out 2 times. The first time it was not running right, but still had pretty good power. The second time it ran ok for a little while, then it left me stuck on the side of a hill 2 times. It would run all right just off idle, but when I opend the throttle it would bog like the choke was on. I did a leak test on it and it was leaking real bad. Over the past 2 weeks I've been working on it. I rebuilt the carb and did a complete top end rebuild with a new Wiseco piston kit. I put a new Clarke tank on it while I had it apart. I tried to install the FMF fatty pipe that I got with it, but it wouldn't fit. When I got everything back together yesterday and warmed it up it still ran like the choke is on. It also won't idle on it's own. I have the idle screw all the way in and it still won't run on it's own. I did another leak test on it and it's sealed up tight now. Any ideas what might be wrong? It has the stock pipe and silencer on it.