Are you sure it's not a "Suzuki" motor from an Aprilia RS250?
If it's a Honda RS250 motor, yep the maintenance will be higher, and the component life much shorter on things like the crank, pistons etc etc. and they'll be a touch harder to get parts for, depending upon the vintage ie pre '93 NF5 (although probably the later NX5 motor with a similar V angle to the Suzi). Setup may be harder and more sensitive on things like squish and fuel used. Also it wouldn't have any provision for running road gear like lights, have no kick-start or oil pump. It'd be a lot peakier around town too, but go like there's no tomorrow when you give it a handful...... Not sure about the legality, but conservatively I'd say no - it'd have a number, but may not match their records.
If it is a Honda motor, and you don't want the extra maintenance hassles, I wouldn't mind taking it off your hands, I have just the chassis for it........ I'm in Melbourne too.
Scott
Last edited by Middo on Thu May 06, 2010 4:52 am; edited 1 time in total