Dboys m4

Discussion in 'Gun Building, Modifications & Repairs' started by cabueg, Aug 3, 2012.

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  1. cabueg

    cabueg New Member

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    Hello everyone,
    First off, I wanted to say that I have tried looking for a thread about this particular gun and problem and could not find one. My friend gave me his old Dboys m4 http://www.evike.com/product_info.php?cPath=21_44_214&products_id=27717 (I'm pretty sure it is this one) and for the longest time it would work for a little while, until the gearbox would lock up. I replaced the 7mm nylon bushings with metal ones, but other than that everything else is stock. I read on here gearbo usually lock up because of bad shimming, so I read up on here about shimming and tried numerous times to shim starting with the bottom gear, and it still locks up. Could it possibly be something else? Or do motors eventually "burn out" so to speak?
    Thanks for any help in advance
     

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