First I will say I have little experience with diesels. I have one that I have not tried yet, and last ran one in the 1970s. It ran great but I could never start it on my own. I did see an article on making heads for diesels from a glow engine. The guy was selling them, and simply made a brass plug that inserted into the regular plug hole. He used a very high ether content. I was going to try it, but the cost and, to a point, availability of ether held me back. I would guess that shimming the head up or down for the first couple runs would be needed.. A regular diesel head might work fine adjusted low. Another gentleman on Utube used no ether in the fuel, and just primed with ether to get it going. I think it was just an experiment and not something to use all the time. He also tried vegetable oil and other things too. (Castor oil is almost a vegetable, maybe not) Anyway, here is the MSDS for ACE starter fluid. I was going to use this, as it is available and goes on sale locally. John Deere, not so much here at least. http://www.kleenflo.com/msds/735.pdf It seems to be around 50% each heptane and ether. I thought a bit of oil was in so there would be a bit of lube for cold starts, but it doesn't seem to be the case here.