The list is fairly long for failure points but not on every saw kit, some common weak parts are the already mentioned pin bearing, wrist pin circlips, piston rings, wobbly crankshafts, poor springs in the clutch, fuel and impulse lines go gooy quickly, carbs sometimes good, sometimes not, piston and cylinders are hit or miss, poor porting and rough castings, poor beveling on cylinder ports catching and breaking rings, leftover casting/plating bits coming out of the upper transfers and ripping up cylinders.
