You can use yz125 power valves in the (non-TM) GG 125 engines. I think there were at least two different versions with different diameter top slide shafts so you need to verify you get the ones that cross over. The Yamihaha versions are a little cheaper new or you can find some good used ones on ebay if your budget so requires.
These pistons are the same as YZ125 pistons which are cheap so I would replace it. I would flush the crank and bottom end bearings with WD40 a couple times and blow it out with compressed air. I would then pour some extra premix oil into the crank area including down the oiling holes in the cases.
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