Bogging down at full throttle

I've had my new bike running for two days and I've noticed if i twist the throttle all the way all at once it bogs down and wants to die. I have an extended intake pipe so should i need to adjust the fuel/air ratio because of that? Or is this normal for breaking it in, it's been so long since i broke in my first bike i don't remember how that went. Thanks for any help.
 
Does it just 'bog' really hard, or does it completely lose all power when you give it full throttle?

& what gas/oil mix are you using?
 
The engine might be 4 stroking. Does the sound change at all when it starts to bog down, does it sound like it's firing less frequently?
 
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