My experience with Husqvarna is you have 7 days to return it for refund. That's what they advertise anyways.
I bought two 550XP's, the one built in Aug. 2016 was a lemon. The last one built in May 2016 was a good one.
Just make sure to check the serial# and make sure it's not built in the July,Aug. Swede's summer holiday production run.😁