Greetings KenNavigk, and welcome to the ODK Forums.

That one would have to be either a 2.5hp 125cc HK25, or a 3hp HK30.
L.1284 is the Kirby 'Specification Number' of that engine.

On that basis, I would plump for a HK30, as there is a HK30 with a very close spec number pictured in this past thread; https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=21282

I don't know of any parts lists or service manuals available for this engine; the 1982-published Gregory's #199 Small Engines repair manual I have only covers the HK25.

There is a Victa HK25 parts list available in this thread, though; https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=72511
Victa uses the Kirby part numbers, by the way.

In any case, Kirby exited small engine manufacture in the 1970's, so the only parts still available are US Tecumseh ones that happen to fit [Kirby did some mix-and-match of Lauson/Tecumseh components, in the engines they built in Oz]. As far as I know, there is no comprehensive part number cross-reference available for these.

This engine rebuild thread has some very useful info; https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=37736

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."