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

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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?

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  • 76 Answers

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

Posted on Jun 29, 2009

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My RV has a Onan Emerald 5000 Genset Generator. I will start it and it will start after 3 times cranking it. Runs fine. Turn it off. Then try to start it again and I get nothing. No trying to crank.


associated problems here are
low oil sensor system faulty
fuel flow insufficient-- blocked fuel tap /filter in tap
problem wiring in the coil area--stop switch
problem ignition control module
take it to a generator repair shop/ mower repair shop for a proper diagnosis and quote

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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

I have a onan 6.5 emerald gen,when you start it it quits as soon as you let go of the start button, will run fine while holding start button on,then quits when you release,please help,maybe field not...


More likely the switch is bad, and only make run contact when in the start position.
Easy to test the switch continuity with a ohm meter when it is not running.

May 06, 2011 | Watts Onan Portable Generator - 5000 ,...

1 Answer

I have a 1997 onan emerald series GenSet 6500 I have been thru 4 starters it keeps breaking the drive gear assmbly WHAT CAN I DO PLEASE ITS ALREADY COST ME 400.00


Have you replaced the solinoid too? If not, maybe the solinoid is staying engaged, which keeps your starter, well starting. If the starter stays energised the flywheel WILL tear up the starter gear.


hope this helps

Nov 04, 2010 | Watts Onan Portable Generator - 5000 ,...

1 Answer

Onan 6500 less than 2yrs old and used once. Try


Your air filter may be stuck with dirt or moist. Try to clean or change it.
In all cases the problem is in the air duct, if it runs well without air filter.

Jul 17, 2010 | Watts Onan Portable Generator - 5000 ,...

1 Answer

It takes a lot of cranking to get started


Possible cause is a fouled plug, remove and clean plug or replace plug. Clogged fuel filter, air filter. I hope this helps, please rate if this has been helpful. Good Luck and have a great day. Jeff

Apr 04, 2010 | Watts Onan Portable Generator - 5000 ,...

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Check all the ground wires and make sure their not broken or loose. If the wires are good next check the neg. Wire to the coil. Too check the swiitch make sure you have continuity too all the post when the switch in the on position, this requires removing the switch.

Aug 09, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Onan 4kw Emerald I generator will not crank


The gen. is not the problem, the engine start circuit is not functioning. You need to look at the starter solenoid and starter.

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