Spark plug drain holes

[darrsi]

Cheers gents this is now on my agenda, had a devil of a job changing the plugs last dime due to debris down where the plug go in.
She runs a bit lumpy first thing in cold wet mornings always though it was just because the engine was cold.

How old are the plugs?
I much prefer the Iridium plugs in my bike, I do notice a big difference, and they're not that much more expensive if you look around, plus they'll last longer anyway so no real money loss.