Mini bike after belt replace still not going fast

#1
I recently replaced the belt with this https://www.homedepot.com/p/STENS-N...Comet-203589-Murray-12-8487-255-299/314222529

Now the torque converter I hear rattles when I turn on bike and I am not able to drive it fast. Looks it bogs down even when I throttle. Before I throw more money on it would love to know what is wring. I checked chain it seems fine. Could it be the spark plug or belt is wrong? Is the belt taking time to settle.
 

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