I´m also owner of a Aprilia RC250 from 81, full red one. I bought it new and asked the dealer to change the White plastic parts to the former Red ones that I preferred at this time. I plan to use it a little bit after roughly 10 years stop. I have to make small work around it and hopefully I´ll enjoy the old time. The engine is also a HIRO with dry clutch and with a valve box between the cylinder and carburator.