I'm guessing a Nighthawk 250; I believe he had a question about it on another thread.
Find a small moto-shop local to you that caters to all makes, they'll probably be mostly dirtbikes and moto-cross. Almost certainly they'll have the manual you need sitting on a carousel labeled "Clymer Shop Manuals" or some-such, gathering dust with 31 other manuals for '80s bikes. (see Clymer Home ) It'll probably run you under $20.
A bargain at twice the price.
There's a good chance they'll also have semi-free knowledge and can get you parts cheaper than the local "boutique" Honda place. The Mom-N-Pop may or may not be friendlier, but they're infinitely more trustworthy.