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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15180
Experience:  Certified on Onan and Generac generators
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I have a Onan generator model number 5.03ga-3cr/16004d

Customer Question

I have a Onan generator model number 5.03ga-3cr/16004d serial number I83599401 part number for carburetor.(###) ###-#### would like to know what's the two screws are for for adjusting fine tune .The motor is running up down up down not running smooth at all could you please help me identify the two screws for fine-tuning
Submitted: 10 months ago.
Category: Small Engine
Expert:  Hank F. replied 10 months ago.

Hello, my name is ***** ***** I am going to assist you with this.

Before you do anything, you must know this - When the engine is speeding up and slowing down like that, it is called "hunting" or "surging". It is caused by a lean fuel condition, and is most often caused by a bad carburetor.

If your carb is bad, you need to have it rebuilt or replaced.

Simply making adjustments to try and compensate for a bad carb can lead to premature engine failure.

Now, with that out of the way, I have uploaded a drawing of your carb, showing which screw is which.

Click here to download the drawing.

Expert:  Hank F. replied 10 months ago.

Did you get the drawing?