Help Measurements - 1HX FZR 250 3LN1 engine

Discussion in 'Yamaha 250cc In-Line 4's' started by ROVER LARRAGUIBEL, Dec 20, 2020.

  1. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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    Hello friends. I have a 1HX FZR 250 3LN1 engine, and I would like to know the diameter of the pistons and their use limit, the same with the rings and cylinder. I have a manual in Japanese but I can't translate it. Thanks a lot!
     
  2. manynathans

    manynathans Guest

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    Bore48.000-48.005 mm
    Piston-to-cylinder clearance0.040-0.060 mm
    Diameter 47.945-47.960 mm
    Measuring point (from piston skirt bottom) 5.0 mm
    Piston pin bore inside diamete r14.002-14.013 mm
    Piston pin bore inside diameter limit 14.043 mm
    Piston pin outside diameter 13.991-14.000 mm
    Piston pin outside diameter limit 13.975 mm
    Top ring End gap (installed)0.15-0.30 mm
    Ring side clearance0.030-0.070 mm
    2nd ring End gap (installed)0.30-0.45 mm
    Ring side clearance0.020-0.060 mm
    Oil ring End gap (installed)0.20-0.70 mm
     
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  3. ROVER LARRAGUIBEL

    ROVER LARRAGUIBEL Active Member

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    THANK YOU VERY VERY MUCH
     

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