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  1. V

    Any one a Dirt Bike Mechanic?

    I just bought an UM DTF 150cc dirtbike for my 17th birthday. I rid it twice, then my back break locked. When I took apart the rear break master cylinder, the spring was completely closed up causing the rear break pin not be able to go in and out. After I took out the rubber parts, the spring...
  2. V

    Any one a Dirt Bike Mechanic?

    I just bought an UM DTF 150cc dirtbike for my 17th birthday. I rid it twice, then my back break locked. When I took apart the rear break master cylinder, the spring was completely closed up causing the rear break pin not be able to go in and out. After I took out the rubber parts, the spring...
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