The first thing I do when scrapping any victa 2 stroke is remove tyhe muffler for the exact reason grumpy describes above, if the piston is only a little scuffed and browned, I keep the motor, any sign of a gouge and it goes straight to the wheelie bin after everything is stripped.
I had one that had been running without oil to the point where the rings had been ground into the piston and the pistons alloy melted over the top of te rings, not a hope in hell of fixing that one.
after initial internal condition of the block can be identified I would be pointing my finger at maybe a blocked jet or depending on the age of the machine maybe a bad spark.
