Josh,
I have an RD-16 which is the same thing, just a couple years newer. Very neat motor. Easy to work on. Ignition components and carb kits readily available.
The way the cowling attaches makes it a bit harder to access things, and makes for some extra vibration noise, but hey, it is 60 plus years old and still going.
Make sure you run at least 24:1 fuel/oil mix, and preferably 16:1.
Here is a pic of mine with my JW-11.
