Carb rebuild kit

Unless something is physically broken or boogered up, there's usually no reason to replace parts. Clean them well.
 
The fuel bowl gaskets- yes.

If it's just the float needle, seat and gasket, maybe it's worth it. However, to me, if your float needle and seat are good that's like paying $30 for 2 gaskets. $5 and some patience and you can make some with paper left over for other gaskets. Also, just 2 fuel bowl gaskets can be had for $7 or $8.
 
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The 80-82 sohc xs400 uses the same gaskets as the 80-84 xs650's which are more available.
 
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