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    FR651V Backfire under load

    I’m working on my Kawasaki FR651V on a cub rzt50 It would start and run fine for about 10 minutes then die; I have 2 of these mowers (other one runs fine) so I swapped carbs; new fuel pump, new fuel filter, finally I found the problem it was the line going from pump to crankcase had a small nick...
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