Rebuilding an RG125 gamma

[ZZ-Rse]

I've always ridden four strokes really other than a brief dalliance with an RD250, so the 2 stroke bike is something of a mystery to me. Had an RG125 rusting in the garage for a couple of years, in the process of dismantling it to generally clean and prep it for use and attempt to get it back on the road. I'm reasonably happy wielding a spanner, not afraid of engine delving and can (usually) put things back together without too many left over parts, but just wanted to see if there was anyone around who knows this breed of bike well and can point out any real trouble spots to look out for.
Thanks