Yes I do have filters on both lines. I will clean them out.

According to the setup instructions the regulator is set up correctly at the factory setting...have not needed to touch it.

OK if I understand this correctly...what most likely happened is the plunger got stuck open causing the motor to flood and back fire when I went to full throttle.

Dave, I really do appreciate the support & answering questions even on a weekend...a holiday weekend!!! That is stellar support. It is your support that gave me the confidence to try a YS and it has made my hobby all that more enjoyable. Thank you!!!!