It may or may not be much the same as a Kirby Lauson VK30, which was a common vertical crankshaft engine of the 1960s to early 1970s. Unfortunately the Kirby Lausons do not precisely follow the American Lausons. It appears Kirby did a bit of a mix and match at times with the bits he bought from Lauson for local assembly in Sydney. However I think there are just about always Lauson equivalent parts to suit the Kirby Lausons, you just can't always find them by looking for the same engine in the Tecumseh manuals.
There is an old Gregorys manual for the Kirby Lausons. I don't know that it would help you much with differences between models, but it covers general overhaul information. It is the only manual I've seen that is specifically on Kirby Lauson engines. However one of our collectors can probably help you more than I can.
