You can make just about anything smoke. All you need to do is get some oil hot enough to reach its smoking point. The challenge with a 46 is that they do not create a LOT of heat, and since the hot exhaust is blown out of the muffler on each stroke (As opposed to every other on a 4-stroke) the oil doesn't get much time to spend in the hot gasses.

I have never had time to play with smoke on a small 2-stroke but it's something I want to do in the future (If I ever get time! )

You can get an inexpensive pump here:

[link=http://www.jcwhitney.com/autoparts/Product/showCustom-0/Pr-p_Product.CATENTRY_ID:2004483/c-10101/Nty-1/p-2004483/Ntx-mode+matchallpartial/N-10101/tf-Browse/s-10101/Ntk-AllTextSearchGroup?Ntt=Windshield%20Washer%20Pump]Windshield Washer Replacement Pump[/link]

For lots of good info on how to make a smoke system work, read this article (The guy who wrote it must be a genius) :

[link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=455]Got Smoke?[/link]

PS, a 4oz tank won't give you smoke for a very long time, but it should give you a minute or two (Keep in mind that when you turn it on and off,, two minutes can be a long time - kinda like the last 2 minutes of a football game (American Football)