Ruling burn damage

[shiwei87tan]

what would happen if a pokemon with Ability: Burning Scales
As long as this Pokemon is in play, the number of damage counters placed on your opponent’s Burned Pokemon in between turns is now 4.
combine with Full Flame (EX Legend Maker 74)? the burn damage remain as 40 or 80?

 

[DNA]

...next time, PLEASE post card scans of the cards in question. It saves so much time in the long run having us look them up.

To answer your question, the burn damage will become "4 damage counters". Neither of those cards say "put twice as many damage counters for Burn" - they both say "put 4 INSTEAD of 2." Both those cards will have the same effect and put 4 damage counters for a burn between turns (if tails is flipped on the burn check).