supergirl42

Ok so I'm fairly new to motorcycling, and I just bought an '83 XS 400 and found a version of the service manual. I'm wondering though, there are several different versions of the XS 400 listed in the manual: XS 400D XS 400E XS 400-2E XS 400F/2F XS 400G/SG,H So I have a few questions, the first being what is the difference between the types? And second, how do I know which type mine is (it didn't come with an owners manual)? Thanks people!