It is 32mm, as I believe are most yamahas.

Also, this is the best �20-odd you can spend before trying to get the sprocket nut off:

http://www.machinemart.co.uk/shop/pr...wrench-kit-12v

...especially if, like me, you don't have a big enough compressor to get an air rattle gun working properly.

__________________
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