Where do I purchase some new wadding ,? I noticed on one of my engines the wadding is brown in color. I assume it means this is burnt?
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The time to replace the wick is when it stops providing decent smoke. I wouldn't worry about the color until it no longer performs. Just being brown isn't much of an issue, when it gets cooked around the smoke resistor, then it's past it's prime. 
Lionel and MTH both sell wick for their smoke units, and of course you can use it in other smoke units as well. There are a host of other substitutes that have been used with varying levels of success, Tiki torch wick, fiberglass insulation, etc....
There was some wadding that was stuck to the resister. I pulled it off It's smoking good now
It's not time to replace it yet. 
Thanks that's good to know. Do you know the price when it comes time to replacing it?
Depends on what you buy. The MTH wick is AA-0000001 and costs $2.
Brown is no problem as long as it's still absorbent. When the wick is hard and black, that's when you need a new one.
