As with most of the Honda V4's of that era, it is likely to be the crank - and most likely a big end. Honda didn't finish the oil holes very well where they break onto the bearing surface and they pick up bearings. In my experience, often this doesn't mean a new crank...the material and surface finish Honda used generally means the crank doesn't crack. I've cleaned up several cranks with good results.
They are however a complex and time consuming motor to do....hence costly....
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