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B&S motor won't run 1981 model 422437

its not the crab as i just put a new one on i
bought tractor from another party , it was pop-in and back firing and
of course spiting gas back, but was running i order new carb put it o
n and at 1st it ran good for about 20 min then started the same as before ,
now i can't get it to start at all unless i disconnect the fuel line and w
ait awhile , then of course only till it drains bowl, it is blowing f
uel out just turning the motor over

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From what you describe it sound as though you have a bad valve, either the intake causing compression blowback or exhaust not opening.

Posted on Apr 28, 2010

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