Wemoto for service items and common spares.

For the less common stuff I've had pretty good service from AJ Sutton. They've got the parts diagrams on their site so it's pretty easy to find the bits you need.

http://www.ajsutton.co.uk/

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I spent a lot of money on travel and racing motorcycles - the rest I just squandered.

XT660Z - Commuter, Adventurer...Racer?

www.dashmoto.net

Other bikes >> MT-03 / CG125BR-J / ER-6F
Departed >> ZXR400L3 / EC300 / DR-Z400E / DR800S / GPZ500S / GS400