A well-built engine, fit and finish is good. It turns over freely and runs nicely on air, with minor bearing wear evident.
| length/inches | 4 |
| width/inches | 5 |
| height/inches | 6 |
| weight/kg | 1 |
| bore x stroke/inches | 3/4 x 3/4 |
| cylinder material | cast iron |
| valve type | slide |
| lubricator type | displacement |