ebond
XS400 Member
Hey everyone,
I got my 78 xs400 running this past weekend but the success has been short-lived. I started the process of checking my valve clearances today only to find that one of the adjusting screws appears to have sheared off and took the locking nut with it. Hopefully you can see in the pictures what I'm talking about.
So, there is nothing holding the rocker arm in place, and it's just free to bounce about on it's own. I think I was able to find a replacement for the screw and nut here: http://www.boats.net/parts/search/Yamaha/Motorcycle/1978/XS400-2E/VALVE - ROCKER ARM/parts.html
Parts number ten and eleven in the picture from that link.
Looking through the manual, it seems like taking the cylinder head cover off is all I need to do in order to get at the broken bits. My bigger concern is that I ran the engine briefly this past weekend, and I'm pretty sure whatever broke off is bouncing around somewhere in my engine.
I'm new to working on any kind of vehicle. My questions are:
Do you think I damaged the engine by running it this weekend with parts rattling around inside?
Could the broken pieces have made it any deeper into the engine than the cylinder head? Will I likely find them when I take the cover off?(it wouldn't appear so from the pictures in the manual)
Are any of the tappet covers supposed to have holes in them? The tappet cover from the same location as the broken screw has a hole drilled in it. I can't imagine that's any good.
Thanks in advance for the help, I really hope I'm not too screwed here.
I got my 78 xs400 running this past weekend but the success has been short-lived. I started the process of checking my valve clearances today only to find that one of the adjusting screws appears to have sheared off and took the locking nut with it. Hopefully you can see in the pictures what I'm talking about.
So, there is nothing holding the rocker arm in place, and it's just free to bounce about on it's own. I think I was able to find a replacement for the screw and nut here: http://www.boats.net/parts/search/Yamaha/Motorcycle/1978/XS400-2E/VALVE - ROCKER ARM/parts.html
Parts number ten and eleven in the picture from that link.
Looking through the manual, it seems like taking the cylinder head cover off is all I need to do in order to get at the broken bits. My bigger concern is that I ran the engine briefly this past weekend, and I'm pretty sure whatever broke off is bouncing around somewhere in my engine.
I'm new to working on any kind of vehicle. My questions are:
Do you think I damaged the engine by running it this weekend with parts rattling around inside?
Could the broken pieces have made it any deeper into the engine than the cylinder head? Will I likely find them when I take the cover off?(it wouldn't appear so from the pictures in the manual)
Are any of the tappet covers supposed to have holes in them? The tappet cover from the same location as the broken screw has a hole drilled in it. I can't imagine that's any good.
Thanks in advance for the help, I really hope I'm not too screwed here.