that is the EPA number the numbers we seek are stamped into the blower housing usually above the spark plug but could be on a plate close to the rotating screen, or above the muffler.Hi,
Well this is what I could find on the Engine.
FAMILY YB5X46252VB 274521
Hi,Remove the spark plug
rotate the engine so the piston is all the way down ( away from the head )
get a telescoping magnet and insert into the plug hole so it touches the sides of the cylinder
A cast iron liner will attract the magnet an alloy one will not