I have smoke on a Moki 180, it's a Don Harris smoke pump. You can't buy them any more, but you can find them on Ebay every once and a while. It makes GOOD smoke. So good, in fact, that a Fire Department heli came and flew over the field with a waterbucket. He flew over, did one circle, and flew off.

I use MDW Aviation SuperDri smoke oil. A lot of people don't think that glow engines smoke well, but they do. In some cases better than gassers do. Follow the manual that comes with the pump and the simple guidelines here, and you can put out some good smoke:
http://www.rcuniverse.com/magazine/a...article_id=455
Brandon