Hi Kye,
Just found the following thread on rebuilding Kirbys. I think this is a horizontal version of the rotary mower verticals (hence H prefix). The work is excellent, the write up more so and the photos a technical work of art. It's really difficult to photgraph shiny metal with a flash and he does it superbly. The thread almost makes a manual redundant.
Even Grumpy was impressed.
See it here:
Kirby H4-4A engine rebuildCheers,
