M-18 does not have balance gears, they are so smooth being an opposed twin,
they don't need them.
Before you decide it needs rebuilt, run it thoroughly and evaluate it.
I've seen something as simple as a dime size rubber breather valve
in the valve cover gone bad, causing oil usage.
As far as gaskets, there a few but none on the crankcase halves or cylinder jugs.
as they use sealant.
Aftermarket pistons/rings and rods are available from Bat4kids on ebay.
Genuine kohler pistons/rings/rods when available, are very costly.
I do prefer kohler for the 2 seals on the crank but cannot speak badly for stens as I have never used them, I do use stens Head gaskets, about $13 ea.
as far as cost, it is going to vary with whats needs done.
They was a fellow who sold rebuilt blocks with cylinders for about $1000, but I think a diligent/capable person could do it for $500 himself.
your results will vary.
Do check the crankshaft for length and size as I don't know if a WH is the same as a cub.
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