Antique;
Try and find a motorcycle shop and get some Klotz and mix the klotz in there. I myself have almost bagged the mixing idea and am going to a permanent glow plug and 50:1 gas. The first tests seem promising but I need to work getting the engine tuned correctly before I mix up other stuff.

I picked up a new walbro 299 but have not put it on yet. I will try the straight glow fuel but it is pretty messy.