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35 hrp Johnson 1998 cranks runs. For 20 to 30 second then shuts off recranks emedately does same thing again

Carbs have been cleaned

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Problem fuel pump ( rubber bits under valves)
failing internals in rubber hoses , vent cap on tank not opened
using e-mix fuels that attract water into the fuel system
blocked filters at the carby inlets could check for corroded wires in the harness from the ignition switch to the motor breaking contact or excessive resistance to ignition current circuit

Posted on May 21, 2017


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Posted on Jan 02, 2017


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Engine shuts off when idles down

Setting the idle speed faster does not help?
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  • Inspect the ignition wires at the switch and through the wiring harness all the way to the battery and the alternator. Look for loose connections and abraded wires.
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  • Set idle speed to factory specs. Do not use gas with Ethanol.
  • Check battery condition and alternator output.

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