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crank rod

  1. what causes thrown rod?

    Yamaha YFM660R Raptor (2001-2005)
    i reacentley got another 03 raptor 660 and it had threw a rod through the cases i have replaced it but im wondering what caused this ? the oil pump works . i noticed a dent in the radiator but no leeks would that caus it to over heat and throw a rod ? the one way is great the clutch plate on...