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Ah 1990... De Niro was in Goodfellas, the first season of The Simpsons aired and Yamaha produced some damn fine motorcycles. De Niro's hair has turned grey, The Simpsons has lost its edge, but a 1990 Yamaha is still a force to be reckoned with. Partzilla takes as much pride in seasoned bikes as you do, which is why we carry the largest stock of OEM parts for Yamaha bikes of all models and years. Explore our exploded OEM diagrams online of talk direct to our service team and you'll find everything you need for your 1990 Yamaha motorcycle.