ORIGINAL: Flyboy Dave
....they might work (give a boost) to a four stroke engine.
It might. I would like to see what the compressor wheel in these things really looks like. Of course, if it really did make boost on a fourstroke, a equal or slightly greater amount of fuel pressure would be needed at the carb spraybar to overcome the pressure in the intake tract. This is where things get complicated.
This really makes you realise the beauty of the YS fuel system and how well it works.