2006-01-06 スプロケ・チェーン交換 Motorrad http://circle.cc.hokudai.ac.jp/horizon1982/beginners/maintenance.html http://t-mitsue.com/machines/GB250/2003_08_24/GB250_chain_2003_08_24.htm http://www.geocities.jp/nieyuki/tyen.htm http://web-prom.com/scottoiler-jp/http://www.google.com/search?q=%E3%83%90%E3%82%A4%E3%82%AF%E3%80%80%E3%82%B9%E3%83%97%E3%83%AD%E3%82%B1%E3%80%80%E4%BA%A4%E6%8F%9B&hl=ja&lr=lang_ja&num=100