If you remove the black plastic triangular thingy underneath the seat on the left side of the bike you should be able to see the clamp that holds the down pipe to the cylinder. From what I remember it's an 'Allen key' type bolt (well it was on mine anyway).
If you are not removing the down pipe off the front cylinder you will probably have a bit of wangling to do to get them seperated.
A good soak in penetrating oil the night before on those nuts and bolts.
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