I own two Flame-Lickers: One Honsel Rebi R2, built in the 1950s (and probably not run since the '70s) and one I built myself from the Bachmann Plans.
Both didn't run - and today was the day I decided to change that.

The commercially built vacuum engine only required minor adjustments - the one I did myself? Well, you'll see, as I take you along the whole road of fault-finding.
Enjoy!

0:00 Honsel Rebi R2
2:28 Cam Modification
3:22 Homemade "Bachmann" Engine
4:37 Inlet Valve
6:52 Inlet Size
7:15 Cooling Ribs
8:22 Membrane Freeplay
10:36 Piston Jamming?
13:43 Running the Rebi
16:23 Running the Bachmann
18:15 Running them Both
20:41 Boiling Over!
21:32 Slow-Motion!!