Echo Pb - 413t Backpack Blower "pb403t" Questions

what is oil to gas mixture for 2 stroke engine model #pb403t? if you are using stihl oil then the mix is 50:1

Spark plug gap for echo pb403t backpack blower .028 but between .025 ~ .030 is ok NGK BPM8Y

fuel mixture for echo PB403T 50:1 and use either the Red Armor or the Echo synthetic ( psst, they;re the same thing and a very good product )

where do you find the serial number of a echo PB403T Model and serial number are underneath the recoil starter, on the engine block. Tip the blow on it's non-engine side and look right above the tank ...