I wouldn't spend money on these mowers as you spend more time fixing them than what they are worth .
I would make a gasket, the gasket paper 30 cm x 100 cm is around $27 on eBay and will last you a few years or just cut a gasket from a cardboard cereal box..
Out of hundreds of mowers I mostly never have to change a carby unless it's broken or worn out , the first thing I do is remove the bowl clean the parts ,if there is a jet in the bowl bolt clean that as well ,then poke some fuse wire up the main jet to clear any blockages ,no amount of compressed air or cleaning fluid will clear this jet sometimes only a bit of fuse wire or a oxy tip cleaner will clear a stubborn blockage .
Even if the rest of the carby is blocked up after cleaning the main jet and fuel bowl area, without taking the carby off ,the motor will run fine in full throttle position ,as long as the needle and seat are working.
If the carby is completely gummed up you may need to pull the needle out and clean the needle and seat.
To test if the needle and seat are working you turn the fuel on with the carby bowl off and hold the float up with your fingers if no fuel leaks then it's shutting off fine then move the float down and make sure fuel is flowing well into the carby then push the float up again to make sure the flow of fuel stops.
It's interesting just by cleaning those parts I mentioned and if the mower still doesn't run right on idle and intermediate stages in the carby but rums fine on full throttle ,just by using BP Ultimate 98 and after a couple times of mowing the lawns on full throttle the rest of the carby has cleaned itself out with the cleaning additives in the fuel and now the mower will idle fine and run fine in all throttle positions.
Most of the time I don't need to remove these types of carbies as I also blow compressed air down all the orifices as well and that's enough to fix them.
I guess if you can sell a mower for $100. that you got for free then spending $30 isn't too bad ,but I see people selling good mowers for $60 now and even a $10 to $20 old Victa 2 stroke will last a very long time.
