For your consideration, here is a Clymer Honda 250 and 400cc Twins 1978 to 1980 Service Repair Manual, no. M334, softcover, published in December, 1981, 215 pages, with full color wiring diagrams. The manual has wear, scratch marks and a few creases on the covers. There is a little smudging on the end pages.
The book will be mailed in a box, for protection. Item pictured is the actual item up for sale and comes from a non-smoking household. (203.275b-1.9bx)
[Thanks for looking!]