Did a Super Swift ( local brand ) Big Bob ( 21" cut ) last year, in fact I did 9 of them for a local farmer who just sold out the the house farmers.
All fitted with B & S 096772 two stroke engines .
Nice engines and fitted with Mikuni carbs.
Got all of them running with nothing more than a carb clean but one had a cracked fuel tank from the owner screwing the fuel tap, yes a tap too far into the tank to stop a fuel leak .
They were all from the 90's but as it was a contra job it did not get booked in so I don't have all of the details.