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on a mongoose motivator, when I spin the pedals the wheel does not engage. I removed the cahin, lubricated, still does not work

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Does the cassette turn? –  joelmdev Aug 17 '13 at 18:54
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If the chain is properly installed and the rear cog is turning with the chain then something has come apart inside the rear hub. You need to take it to a bike shop. –  Daniel R Hicks Aug 17 '13 at 21:59
    
From a quick Google, the Mongoose Motivator appears to be a BMX bike. If the back gears are spinning but the wheel isn't moving, then there's probably a problem with the freewheel. Perhaps the pawls are stuck. –  Kibbee Aug 18 '13 at 11:45
    
The pawls might also be worn or powdered. Does the freewheel make the typical ratcheting sound if you spin the wheel? –  arne Aug 20 '13 at 8:07

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