If its dying when you open the throttle its probably the low speed needle. Set it to what they recommend then turn it 1/12 clockwise and try again. If it still doesn't work do the same. After a while it should get better but be sure you don't lean it too far because its a new engine. Just get it so it doesn't die untill its ran in, then tune it more. Also try keeping the glow starter on the plug. Engines at break in aren't the easiest things to get along with but it does get better after this.