The Honda CL400 is a motorcycle launched by Honda on September 23, 1998.
The motorcycle has a single-cylinder air-cooled 387cc engine (the NC38, also found in the XR400R).
Information on the motorcycle in the English language is limited, including workshop manuals and other such material. It is, however, very similar to the XR400R. The specification of the motorcycle can be found at the Honda Worldwide News Site
References

Honda CB600F
Honda CB-1
Honda CB150R
Honda CB360
Honda CB650
Honda CBR1000RR
Honda CBX250RS
Honda CHF50
Honda CX series
Honda MB50
Honda NS125
Honda RC212V
Honda ST series (minibike)
Honda VT250F
Honda XL175