Paul, I've never owned an Eagle, so I'll have to take your word for it on being a motorcycle-tanked scooter. I don't think it matters either way, as I see no clash between riding a machine considered to be a scooter or a motorcycle. I believe that a motorcycle enthusiast can own whatever machine they want, 150cc or 1500cc or indeed nothing at all, yet still be an enthusiast.
I think what this discussion demonstrates is the difference of interpretation of the word 'scooter' in different markets. As you can appreciate, the term 'scooter' is loaded - especially in the US, and UK where feet forward machines, typically with large plastic/metal bodywork are not popular. Not so in Japan, where they are the majority of machines in Tokyo.
Whilst 'trolley wheels' were the hall mark of a scooter in the UK, the swing axel is the hallmark over here - as conventionally swingarmed TMaxs etc are very good sellers over here, and this has been discussed with interest prior to their debuts back in 2000 & 2001. The Honda 90 as you call it, or the Cub as it is known over here is considered technically a motorcycle, but most just refer to it as a Cub. In fact, over here machines of 49cc and below are termed 'genchari' which basically means 'moped' (even though they have no pedals - similar to in the UK), 50cc - 200cc machines are termed 'scooters', and 249cc to 399cc machines are termed 'Big scooters'. Nobody is quite certain what to call the non-swing axel 500cc plus machines, so they are either termed 'Big scooters' or 'GT scooters', or indeed addressed by model name - SilverWing, TMax, Skywave 650 etc, much like the Cub series.
The Gilera DNA series is a good contemporary case study for the terms 'scooter' vs 'motorcyle'. This is widely considered to be a scooter with the appearance of a motorcycle. Note the swing-axel.
http://mypage.bluewin.ch/imperadorimoto ... ra-DNA.JPG
What do you think? Scooter or bike?