What about the CBX400F, 4 cylinder 16 valve, 400cc, I had one back in the 80's to ride to uni on, rev-o-matic motor and really good handling, weird inboard disks, prolink suspension on rear and mechanical antidive on front.
There is also the GSX400F, or the impulse 400s, now they were fast, really a GSXR400 without the fairing, had about the same performance as a TZR250 of the time.
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