Popping sounds from the Exaust??

OK i got the X6 4 stroke all automatic no gears and it goes ok but it should go faster than it does . but while riding 3/4 full speed and letting of the throutle the bike starts making a popping noise from the exaust . Im not sure if its normal for it to do that but if its not then what is causing it and how should i fix it . Im almost thingking on having it looked at bty a dealer out of state .

Thats called backfire my thumpstar does that sometimes too

If you have the 110cc engine the popping is normal once my bikes warms up the popping stops. These bikes have there quirks this is just one and the exaust system is junk. My bike went 46 out of the box and runs better now after some break in time.

It has less to do with the exhaust being crap than it has to do with valve timing, I think it's pretty normal...