Is that the brakes start of video

Nov 25, 2017
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New Jersey
So I finally finished and fully rebuilt the motor and all bottom and top end are fresh. Now at the start of video is a weird tap noise what is that the brakes? Any info will be awesome also Plastic wasn’t fully harnessed.
 
video sounds like it only happens when quad is in motion?
start spinning stuff with engine off and figure it out
like front wheels jacked up off ground
jack up azz in nuetral spinn rear tires chain ect:)
 
mmm What about chain rollers? Have you got them installed? Chain rubbing on the steel shafts the rollers should be on?