Question about Watts Onan Portable Generator - 4000 , Model# 5500

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Onan 4000 will not start. Removed spark plug, it is oily and smells old.

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If this is a two cycle rebuild and clean carb. If this is a four cycle your rings are going bad, the smell would mean trouble.

Posted on Nov 13, 2010

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What is the point gap for model:CCKA-S/25830?


Spark Plug # RS17YX for Onan 167-0272 on RV Gensets ...

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Generator Parts Spark Plug # RS17YX for Onan 167-0272 on RV Gensets ... for this plug require the spark gap to be set at .025" (25 thousandths of an inch).

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Nov 04, 2015 | Watts Onan Portable Generator - 4000 ,...

2 Answers

My generator will turn over but wont start


Our motorhome Onan 5000 Marquis generator will turn over and try to start but fails everytime we test. We have primed, gas and oil are fine and we have new spark plugs. We also changed the gas filter on the generator. Any suggestion? Thanks, Loretta

Mar 30, 2014 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan 4000 generator has no spark


If there is no spark, the ignition module may be bad, or the wiring to it. Have the module ohmed out. Also the magnetic trigger assembley that is on the rotor that sweeps past the ignition module maybe broken. If they check ok, suspect the control board

Mar 23, 2013 | Onan Microquiet 3600 & 4000 Generator

1 Answer

Generator does not start, how do I fix it


It could not be starting for any number of reasons. Old stale fuel, carbeurator out of adjustment, bad spark plug, dirty air cleaner.

Apr 30, 2012 | Watts Onan Portable Generator - 4000 ,...

1 Answer

I have a micro quiet 4000 starts up but surges up and down , could it be just old gas making it run so bad


The reason can be:
  1. Bad or loose ignition (spark plug, magneto, coil cable etc);
  2. Water in the gas;
  3. Dirty fuel strainer;
  4. Not set on level surface;

Jul 10, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan generator service codes


Check the spark plug and the ignition coil for good sparking.

Get the spark plug out, or with another spark plug connected to high voltage cable, outside the motor, the outer part of the plug connected to motor ground and see if spark is present at cranking.

Jun 30, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

I have a Onan 5000 Emerald 1 that wont start. tried to replace the plugs and it ran about 10 minutes. The plugs are fouling like it is not getting any spark. Any thoughts?


yes you seem to have bad rings on your piston or you could have a scared up cylinder wall are your plugs oily when you take them out ? you should be able to change piston rings if you take the head off give me the motor type h.p. model and serial #s i can check for you

Jun 15, 2009 | Watts Onan Portable Generator - 4000 ,...

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