Lots of good info in here if you go raking

http://www.honda.co.jp/pressroom/products/motor/nsr/

Another find after having a poke about:

http://www.honda.co.jp/factbook/motor/NSR250R/19890100/index.html

Use the search engine within the site and you get owners and their bikes

Enjoy!

MM!
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Resistance is futile!