how do i fix my bikes crank setup?

Shane

New member
my bike i am building was just finished yesterday or so i thought. i got on my bike pedaled an my crank only went part way before losing it. it just didn't have the tension to go all the way around it went halfway before it just wouldn't turn. when i get off and walk it the pedals rotate back then when they get halfway they just fall back down? why, why?????
 
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