There’s one on eBay if you type in 1986 Honda rebel 250 shop manual there’s one that says shop and one that says service manual I have the service manual just trying to figure out if there the same thing or one is different.
Those are generically similar, and have similar content, whether they are called service or shop manuals. FWIW, I prefer the Honda manual over others. My second generation Honda manual says it's a service manual.
I am sure that if they are not identical, that they are virtually the same thing. On a slightly OFF topic, what does your service manual say for the valve lash/ clearance adjustment for the 86. I have seen a couple different things, one stating .002", and another stating .002" -.004". I don't want to set close to .004 if the spec is actually .002". I am wondering if the newer models have a different spec.