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600 ves no power

  1. Pro x 440 600 ves swap problem cant get over 6k rpm help I'm confused.

    Engine
    Ok so here is the story. My buddy bought a 2004 pro x 440 with a 600 ves motor I believe It is from a 2000 xc from the extra parts that came with it all gen 2 stuff. He got it guy said it needed carb work or something never ran right motor made bad noises tore it apart replaced pistons and outer...
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