cbfarmall what type of coil is fitted to your saw is it a 3 legged mount if it is it is a CP 125 if it has a 2 legged mount its a SP125. For i recall your saw had a round style of muffler fitted off a CP125.
By the way i'm chasing a good piston and cylinder assy to suit a SP125 or SP125c if you have one that is for sale let me know.