They are from a sweet spot in history. There was adequate technology to make them reliable and high performance but inadequate technology to truly perfect suspension geometry and engine layout. The big-bang four was intended to reduce rear wheel slip by maximizing dwell time between impulses. Modern bikes can make far more power and let computers do the traction control. But the VFR400 is a carbureted fully mechanical bike. The ignition is electronic but no more complex than points. Just more reliable. It's a real joy to own, maintain, and ride. It isn't even fast, but it sure feels like it's doing something!
My NC30 is actually an EFI conversion project running Megasquirt. I got tired of trying to get to the carbs... ;-)
When I did the valve adjustment I asked for parts for some other Honda that was sold in the US. There’s only two diameters of shim so once you find a compatible model you just order parts for that. Same for oil filters and non-exotic parts. Other than that you’re calling Rick.
My carbs work perfectly and I refuse to ask or answer any further questions on the topic ;)
Thanks for the tip on thevisorshop.com.
I'm intrigued by the EFI conversion. That seems like a big project. If you want to chat more send an email to my username at the domain in my profile.