Originally Posted by
w8ye
They are conversion weed whackers
Don't bring much money at swap meets
Could be a reasonable experience if they're yours. You could enjoy them as casual model airplane engines for years.
But they are not 3D engines period.
The second engine looks like a CRRCPRO 26CC, it is based on a converted weedy and unlike the Ryobi 31cc doesn't have a good reputation for longevity.