By just going from the Toyota 2F engine manual, there’s 2 pages talking about the cylinder head valve seats during an overhaul and none of the info mentions replacing the seats. It’s either cut one way or another. Personally I don’t know.Any info on that?
You’d think that if replacing the seats was an option, they’d mention it in the manual, like they do with the valve guide bushings.
See attached pdf for all the info that’s available in the 2F manual regarding valve seats