Remove the side panels and lower fairing panel.

Put a catch tank on the floor below the lower cylinder.

Undo the drain bolt in the front of the lower cylinder - think its an 8mm.

Remove the radiator cap slowly - the fluid will gush out a lot faster when you do this, so be prepared with your catch tank (coolant is not great for the environment, so try to be responsible for disposing of it properly).

Check if there's any coolant left in the expansion tank on the left hand side. If so, just pop the pipes off and drain it from there.

With the ignition off, kick the engine over a couple of times to expel what you can from the water pump and pipework - probably not much.

Refit the expansion tank pipes.

Refit the drain bolt with a new crush washer.

Refill the radiator. I think the system holds just under a litre (900ml), so one tub of ready mixed will be sufficient.

Fill slowly to try and avoid trapping bubbles, and once the radiator is full, gently rock the bike a bit to see if the level drops. If so, keep topping up.

Kick the bike over a few times to pump fluid round the system, and again if the level drops top it up.

Check the level in the expansion tank.

If you've got all 900ml in, then great, job done.

If not, and the radiator is full, suck a little out to leave an air gap and loosly fit the cap. Start the engine to pump fluid round the system.

Lift off the radiator cap and hopefully the level will have dropped, though watch out as it may also push some out the top of the rad if there's a significant bubble in there.

Don't let the engine run for more than a minute or so if you're concerned that there's not enough fluid in the system. In this case, shut it off, fit the radiator cap and lean the bike over to the left as far as you can, then the right. Once upright, have another look to see if the level has dropped.

Personally I've never had any trouble refilling the system, so you shouldn't need to be fannying round trying to find bubbles!

Good luck, and let us know if you have any problems!