Ahh man I'm so jealous! You'll love it! Go to Ueno, in the Taito Ward district and you'll find the huge motorcycle city with Corin etc... Pretty much everywhere you'll find bike shops though... I loved the little NGK pavement vending machines selling anything, even BR9ECM's
Also try Shinjuku, Ikebekuro, Ginza...
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NSR300R - Why did i ever have a 250...