Advance the throttle. Use the throttle trim tab and advance the throttle as much as 25-35% prior to priming and prior to starting. For now, start with the wheels off the ground, too, until you get squared away (break in, tuning, etc)

Enjoy.

Use fresh fuel. If fuel has sat in tank, suck it out and start with fresh fuel. Don't leave container open or in light.

Let me know what happens.