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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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  • Motorcycles Master
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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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Runs fine until it gets warm or hot then cuts off then cools and will recrank


Does it crank over when the engine is hot. If it does sounds like your maybe loosing fuel if so check fuel pressure if t is good check for spark could be a bad crank sensor or bad distributor.

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I have 2000 90hp Johnson. The engine starts fine, but after running at higher rpm if you shut it off let it sit approx 30 min it will restart but when you throttle up it bogs down and will not accept the...


Sounds like a fuel restriction. have you checked the fuel pump? Your carbs may also need to be cleaned, there are "circuits" and pathways in carbs that get clogged and need to be cleaned and rebuilt. when was the last time you checked the fuel pump or carbs?

Aug 18, 2010 | Boating

1 Answer

Will crank and run for a second but stop then gas


Engine is flooding, need to pull the carbs and clean them. Carbs need to be taken apart, the jets removed and cleaned out. The low speed jets, the small ones, have a very small hole in them use a single bristle out of a wire brush to clean it out, do not make the holes any bigger. once you get the jets cleaned out, put em back in, reassemble the carbs, reinstall and have a good ride.

Mar 18, 2010 | 1999 Suzuki VZ 800 Marauder

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Stalls after cranking , will recrank and if


try cleaning the throttle body and check the vacume hose on the front of the throttle body for cracks.or hoses off.

Jan 02, 2010 | 1998 Dodge Dakota

1 Answer

Engine shuts off when idles down


Setting the idle speed faster does not help?
  • Check to see that the choke is not partially on.
  • 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.
  • Drain the carbs and clean them with B12 chemtool or any other good carb cleaner. The idle circuit in the carbs is probably gummed up. To clean the carbs properly they will need to be removed from the bike. Be sure to synchronize and balance the carbs when reinstalling.
  • Remove and clean the petcock water trap and clean the trap of water and rust etc. If a filter screen is present clean it as well.
  • Set idle speed to factory specs. Do not use gas with Ethanol.
  • Check battery condition and alternator output.

Mar 15, 2009 | 2004 Honda VTX 1800

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