A choke-tube with velocity-stack configured Bee

I bench-ran a .049 reed-valve engine last weekend as part of a water-cooling test. I had set it up with a choke-tube and an experimental velocity-stack.. which created too many variables for my test. It didn't go well.. lots of gremlins came out of the woods... and stuck their fingers in my work..   (that's my story.. and I'm stickin' to it..)

This afternoon.. I got the urge to reconfigure a different engine.. in a similar way.. but not water-cooled. The engine came in a "box-O-engines" that I sourced a few years ago. A Babe Bee with a single fill-tube on the backplate.






missing needle.... and a cam-style starter-spring.. without a hex drive-plate.    

Very clean inside..





I donated a needle from my Bee needle stock... stuffed the 5cc bowl and mazac/zamac backplate in a little baggie.....    and proceeded to put together an alternate "back-end" for the little mill.

I gave the back of the crankcase's gasket surface a little "massage".. over glass and 600 grit paper...



I had done a "needle-seal" using silicone tubing on the water-cooled engine's carb. and I wanted to do the same to this engine. I paid a bit more attention to the fitting of the tubing... to the needle.

I found a small flat-washer that fit perfectly around the needle-shaft and up against the spring-collar.



then I cut a length of tubing* to make a seal.





There's ample clearance for both; the tubing-seal.. and the flat-washer retainer.



With the back-end/carb. configured; I decided on a cylinder-orientation. The choke-tube (height) interferes with a parallel cylinder if using the Cox (Sandblaster) heatsink.. and the Cox heat-sink is replacing the water-cooling for this engine's testing. Therefore; I reoriented the cylinder position from 12:00 to 3:00; which will work for an application that is waiting.



Orienting the cylinder/crankcase 90 degrees from the NVA when using the horseshoe backplate/carb. leaves one of the four engine-mounts inaccessible from the front-side. This can be defeated by the use of #5 cap-screws and a ball-end driver.



I made some modifications to the bench-mount. When the engine "ran" for the water-cooling test; the tank was gyrating..



I'm actually "happy" that my little custom clunk-tank fed the engine.. until I pinched the line. I decided to make a mount to keep it still..







Oh.. almost forgot; the velocity stack is made from a brass compression-fitting with a heat-shrink sleeve to lock it in place.



If the weather permits tomorrow; I'll run er' up... and report.