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I own an Onan 5500 Marquis Gold. It starts but runs real rough....like…

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I own an Onan 5500...
I own an Onan 5500 Marquis Gold. It starts but runs real rough....like a choke is sticking, then dies. I've pulled the carb and cleaned it entirely. Didn't see any plugs or gump. I've added Seafoam to the gas in case it was old. Better, but no banana. Can anyone give me some ideas short of replacement?
Submitted: 8 years ago.Category: Small Engine
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Answered in 2 hours by:
6/27/2010
Technician: Hank F., Technician replied 8 years ago
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 16,006
Experience: Certified on Onan and Generac generators
Verified

Hello,

The first thing you need to do is to check and make sure both cylinders are firing.

Check the condition of the plugs and replace them if necessary.

 

Let me know if both cylinders are firing.

 

Also, what is the full model number of the genset?

 

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