| Yep ... not always the front coil, as I know from first hand experience. The rear one is also susceptable, especially if you wash the bike often with it on a paddock stand. The top of the roker cover is dishe and water pools there and works it's way into the coil tube.
To get to it is not hard ... but you need to lift the seat/tank unit to the extent that the fuel pipes will let you then you can work the coil out. You might find it is wet and rusty in there.
Note: Watch out for the left hand fuel pipe when refitting the tank, as it can get trapped on the top of the rocker cover bolts. If you prod it then it will fall into the recess provided for it in the bottom of the tank. In fact, it could well be this that is causing you grief if you have had the tank off recently? | 
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