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zx10r engine gen4 year

  1. Gen 4: 2011-2015 Is the any difference between the gen 4 year engines?

    The ZX-10R
    Hello, I am think of buying a gen 4 engine. Is there any difference between a 2011 and a 2012/13/14 engine? Is there anyway to physically see difference between a 2011/12/13/14? Anyone?