YAMAHA RD400 ( 1AR ) 1978 - 79:workshop specification card / that came from Yamaha & given to the dealers , this was used by the Yamaha mechanics so all the important information was ready to hand in one place in the workshop when bikes were being serviced , it has 43 different original specifications on that can be referred to inc ; engine spec ( bore / stroke & compression ) / electrical specs / ign timing & electrical resistances / carbs specs + more , very useful specs card / great for any Yamaha RD400 owner to have with the bike , my uncle used to have a Yamaha dealership back in the 80’s & were kept as a mementos …. ( See pen in the picture to gauge the size ) . P&P £3.75 by registered mail in U.K. / will airmail worldwide ….