This Cox Babe Bee .049 has never been run and was purchased with the original package and the instructions on eBay. These gems are no longer produced, and getting hold of one - especially with the original package - is costly if you shop on eBay. They regularly sell for $100 or more.
This is one of the later model Babe Bee .049 engines that was sold just before Estes, who bought the Cox model line, stopped producing and sell them altogether. Note the black fiber fuel tank rather than the turned aluminum fuel tank of the Thimble Drone era. It looks kind of like a Black Widow .049, but it is not. The package is marked as being the "350" model.
I was really looking for one of the original metal tank versions, but bought this instead when it came up for auction. I'm still waiting for a deal on one of those.
Below are the four pages of the original operating instructions and troubleshooting guide.
Read of the public unveiling of the Cox Babe Bee from the April 1957 American Modeler.
Here is my Golden Bee .049, in case you are interested.
Cox Engine Operation & Troubleshooting Guide
Copyright owned by Cox