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  1. S

    Grinding the inner wall of the cylinder?

    The inner wall of the cylinder has been machined. But I don't know if the inner wall needs to be sanded, or use a piston ring to run in?
  2. S

    Assembling the crank, crankshaft, encounter difficulties

    I am not a professional mechanical processing worker. Parts are not made by me I have processed most of the parts and tried to assemble and have problems. The parts of the red arrow are active. Is this normal? How to install the green arrow? How to assemble angle accurately?
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