Two strokes are different from 4 strokes. I'm chiming in because no shops have and it'll get this moved to the top.
If you look how a two stroke works, the fuel mixture comes from the carbs to the intakes.... from the intake to the crank to lube it ... to the transfers and to the top of the piston. When a two stroke blows... it blows. If a crank bearing breaks, it usually take the bore, cylinder and head with it. If a piston skirt goes, it usually take the bore, head, and either takes the crank or gets if full of debris. This is why it its recommended to change your pistons before they make you change them.
Check out this link to see the 2 strokes.
Here's a pic.