carburetor

Hi guys I am new to the forum and recently have taken on the challenge of restoring an xs400 (it's a interesting story how I ended up with that but it's not for now). Anyways the bike hasn't run for a long time (21 years) so the carbs are oxidized, gunked up, and deemed beyond the point of...

howdy, I'm very confused! For some reason my 79 Xs400 will only run for about 15min. Just enough time for my mechanic to ride it around the block a couple times come back and tell me it runs fine. Then when I get on it after a couple laps it dies whenever I put the clutch in. At first I...