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660 timeing

  1. 660 keeps skiping / jumping time

    Yamaha YFM660R Raptor (2001-2005)
    i rebuilt my motor with some help from bt website thanks alot guys . it ran great for a day whiellies easy and fast 87.6 on the vapor gadge. not shure if its programed right with the tire size but anyway the problem im haveing is after about a day of rideing hard it starts to jump off time by 1...