Dude:

My best friend tried the smoke system and it was just trouble .
We had metering issues too much oil ,too little and gernerally a great big mess and expense.

Remember the keep it simple stupid thing well I think it applies to smoke systems too.

Try this complicated and simple method.

1. It's not complicated

2. It always produces a nice stream of bright white smoke.

here goes.

http://www2.towerhobbies.com/cgi-bin...?&I=LXFT71&P=7

just mount it under the landing gear and shield the bottom in the spray zone with small piece of metal duct tape.

Eric

Works great and try it first on your trainer .
PS make sure you are on the nose heavy with the cg.