Will it be possible that you guys have a bad batch of conrod in the EVO2? I have been running mine and till today after almost 1 gallon of fuel, the engine is still going strong.
What I did for break in is WOT at rich 2 stroke for 3-4 tanks and race tuned the engine on the track in the next 2-3 tanks.
Btw I am running the AAC 5 port with OS 6 plug, fuel o'donnell 25%.