1981 xs400

What are y'all running on your 1981 xs400s? I have mag wheels, Wondering if instead of a 120/90-16 on the back would it be ok to run a 120/80-16? What would I notice (If anything) if I did? Thanks a lot in advance!

Hey everyone, Just got my M2 license here in Ontario and looking at bikes. Whatever I buy will be my first bike purchase ever!! Just looked at a bike I think has a lot of potential… a 1981 Yamaha XS400. I'm adding about 40+ pictures for you experts to let me know what you think. Hopefully you...

Hey xs400 gods, I come with a minor question. My mufflers cracked completely off the header pipe on both sides near the "H" crossbar. My question, what size is my header pipe? I've measured the open end (the inner pipe inside of the muffler) and it's 1.25" is that right? I want to get some slip...