How can I get my gocart motor to turn over?

I just rebuilt my gocart motor, from taking instructions from DIY videos, and I can't figure out why it won't turn over when I pull the pull cord. I have tried the tricks I have seen in the DIY video tutorials but still nothing.

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Can you give us some info on the motor? 2-stroke? 4-stroke? Briggs & Stratton? Honda? How many cylinders? Does it have compression? Could be a lot of things without knowing more details.

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