You need to get a tip truck mate, cheap over there.
Fancy concreting around a tree like that.
I did a leopard tree out of a bucket then chipped it with an 18" ... I thought I knew the customer from somewhere ended up she was the lollypop lady at the school kids go to. LOL
Husband was a mechanic so he had a timing light, we checked the Kanga's stump grinder was firing OK and now have to get a new carby.
I've stripped that stupid carby 7 times now and clean it out etc ... within 2 days it's stuffed again. Cant find a second hand one anywhere and they want like $500 for a new one. It's a 24HP Honda engine.