There are least five available in Europe on ebay at the moment, the cheapest being this one:

http://www.ebay.co.uk/itm/yamaha-xt660-engine-motor-block-motor-xt660x-xt660r-5vk-/131680291836?hash=item1ea8c1cbfc:g:h54AAOSw3KFWdVC e

Although I's guess you'd have to twist his arm to ship it to Australia!

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