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Does anyone know if a cylinder head assembly from a 1980 model will fit a 1981? I checked the parts catalog and the part numbers are different for the cylinder head assembly between an 80 and 81, but that doesn't always mean they aren't compatible. Looking at pictures, they look identical.

I got the head off last night. Thanks for confirming that I can install the new timing chain without splitting the case - I can see now that I've got enough room to work with by installing it through the "valley". One other question: does anyone know if a cylinder head from a 1980 model will...

I got everything timed correctly. Unfortunately, on the first attempt to start up the motor, the timing chain broke. It's likely that at least one valve is bent. I'm going to pull the head to inspect (and likely replace) the valves, but I'll also now need to replace the timing chain. Is it...

Update: I wound up replacing the rocker arm and dropped the head back on. Did my first valve adjustment on the left cylinder, but as soon as I went to adjust the right cylinder, I couldn't get the crankshaft to fully rotate. Wound up taking off the head, again, and inspected the timing. The...

I picked up a non-running 1981 XS400 Special. Long story short, the motor spun freely and the starter would spin the motor, but it refused to start. After digging into it, I found that the exhaust valve adjustment screw and locknut had completely fallen out of the rocker arm for the left...