Gravely 520 (maybe).
I've had this gravely for a while and it's a beast. I've recently been having problems with getting it going. I know the inside of the gas tank is rusted, so I'm sure that's not helping my cause. Im trying to narrow down the exact model of this gravely, mainly because I'm interested in retrofitting an electric start on it and to find a good source for a plastic tank for it.
It has a kholer k181-30645 engine, the lid says gravely 520. The serial number is 00200199, which I'm assuming is 200199.
Also, someone told me to run higher octane in this because today's gas is garbage. Any truth to this?