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kfx450 won't hot start

  1. starts right up cold..it cranks and cranks and cranks

    I've been scouring the forums trying to resolve this. Two weeks ago my 09 kfx450 w/ full yosh exhaust, k&n filter with air box lid removed will fire right up when cold. Once it gets hot it will crank without even wanting to start...I realized if I turn key on, let the fuel pump run then turn...