found another 10 cube today. This belongs to Sam at Madsens chainsaw shop in chehalis.
My first visit to this walmart sized shop..cool place.
this 090 10 cube was on a pallet 20 foot up on a rack and they
hauled it down for me to get some pics.
Sam's story of the 10 cube was that when mcCulloch ruled the
kart tracks stihl wanted to build a motor to beat them . Not really intended
to be used in saws but seems like a few were made and only a few are still known to exist.
I knew Madsen had a 090 hotsaw but I did not know it was the 159cc till today.