All the FZR400 engines are stamped with 1WG .... you want a silver painted engine, try to get hold of the CDI for it and that will have the model code on it.
Really you want an EXUP engine either 3en1 or 3en2 ... the 2TK would be ok too. The earlier Genesis engine will probably fit (but I don't know for sure), these are painted black.

Evil - thanks

I think from what you say it would rule out the one I'm looking at - 21k miles on it and black makes it sound quite new:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... K:MEWAX:IT

Nope not that one :)

Keep looking something will turn up

Genesis and 2tk engines are the same size/mounting