Hi mandkn

The carby kits an interesting one as it depends how far you need to go to replace the gaskets. I think the main problem with the carby on these engines is that their kind of a mixed bread with the U.S parent company Tecumseh/Lauson and Kirby. Although the Kirby is the same as Tecumseh engines theres a slight difference with the air filters and the carb design, maybe CyberJack can give us a bit of a history lesson with the design difference of the U.S version and Aus Kirby if my thinking is correct. As far as I believe you can only get carby kits for Tecumseh/Lauson and not Kirby which means it's going to be a bit missed matched, I have found most of the gaskets are still ok to re use if your carefull the only things I replace is the float bowl gasket and clean the rest up.
I still haven't been able to find a float needle the same, as the kits online are different with a spring and a rubber seat which these carby don't use. You can still get the fuel drain kit on the bell housing which I just make my own rubber gasket as it's just a small flat piece of rubber. For reference I order carby kit 631021 and only use the float bowl gasket and nut washer as the rest isn't compatable, some of the other gaskets might come with the Tecumseh engine gasket kit 33233 but I can't remember. The gaskets between the air filter and carb I managed to get from a local mower shop that's been around for 100 years and had buckets of Kirby NOS that I spent hours going through checking part numbers and found only a handfull of parts.
If anyone knows of a different kit please share as I would also be interested to know what others order as this is how I do it and know that I had problems doing a complete carby kit as there was no reference.
I'm currently doing my second Kirby rebuild as we speak, so if you follow my SB model 38 edger rebuild you can get some more reference as I'm more familiar with the second build as I was with the first. I just ordered these kits mentioned above to do the second rebuild.

Carby kit link ODK
https://www.outdoorking-forum.com.au/engines...b?zenid=a814ed7eab3024978e48120f9472a33b


Cheers

BS

I've got a highway to mow