Help diagnose Yamaha 400 enduro.

[1991MX'r]

My dad and I were riding around on our Yamaha 400 enduro a while back and It broke. The clutch cable was a little stretched and when I kicked it down from 4th to 3rd gear It jumped and stalled. Fired it back up and it is stuck in third gear. Wont shift up or down. We haven't had time to pop the clutch cover to see what is wrong though. What do you think happened?

 

[2 strokes for life]

The shifter cradle probably got caught on something in side.

 

[1991MX'r]

Different swing arm on 1979 YZ400F?

Can I put a later year swing arm on a 1979 YZ400F. Just the normal looking one with out the split swing arm?

 

[2 strokes for life]

1991MX'r, not unless you plan on re-working the suspension position so the linkage will meet with the swingarm.

 

[limp1969]

shift fork, got to split the case

 

[1991MX'r]

We found the problem. on the end of the shift drum theres a stopper cam to put tension on the whole assembly. In the bottom of the case there is a bolt with a spring and a cam follower on the end of the bolt that follows the stopper cam. The previous owner thought this was the oil drain plug, removed it and replaced it incorrectly. Instead of putting the cam follower on top they put the spring on top, which got jammed between the shift drum and the stopper cam, jamming up the whole mechanism.

 

[2 strokes for life]

1991MX'r, thats good to hear that it was a easy fix for you.