Lyle,
OS made two pulse jet sizes, one is the same size as a Dynajet and the second was roughly 1/3 to 1/2 that size. I had one on a bid demo ship, it was the most reliable starting jet going. I ran straight white gasoline, ford vibrating coil and use a bicycle pump to start.
The trick with the bicycle pump is to drill out the end to remove the stem depressor and get full air flow or just cut it off and use the hose over the air blaster connector. If you do a post on the pulse jet group on facebook you might get the instruction manual or one from a Dynajet.
Best, DennisT