Talked with a bloke that does a bit of this with RC gear, and does a few
"shows". He uses diesel fuel and about 20% white oil like you would use on
your rose garden. The white oil makes the smoke much whiter than straight
diesel, but cannot be mixed to thick so it won't flow. He preheats the oil
mix in copper pipe that goes past the head before it goes into the exhaust
pipe at the hot end near the head.

This is on glow plug and whipper snipper two strokes, but may help.

Peter