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Explanation: Harley-Davidson is translated as "ハーレーダビッドソン"(pronounced as hah-leh-dabiddo-son) or just "ハーレー" (hah-leh) in Japan.
One of the oldest H-D fun club uses kanji 晴旅人尊 for Harley-Davidson, pronouncing it "hare-tabi-bito-son". This kanji expression means "Clear Sky Traveller Image". Another way to express the Harley-Davidson is "アメリカンＶツイン" (American V-Twin).
Try a Japanese seach engine http://www.google.com/intl/ja/ in which you can search by English. You will find many WEB sites pertaining to H-D in Japan.