Depends on what you need. Common items such as oil,filters,spark plugs and others. You can buy at any good auto parts house. Sears also sells parts along with your Onan dealer. You can also find older parts on line and at Ebay.
One can find parts for an onan engine online. Some of the useful websites are Onan Parts, Discount Online Parts, Cummins Onan and Jacks Small Engines.
As for as I know Onan never published that information. If it is a non Onan engine. You will have to check with the engine manufacturer.
Depends on what engine you have.
need a wiring diagram for a sears ss16 tractor with onan engine
form_title= Onan Generator Parts form_header= Keep your generation running with new parts? What is the model number of your generator?*= _  What parts do you need?*= _  Is your generator still under warranty?*= () Yes () No
Depends on what the equipment you have.
What is the reported manufacturers weight of the ONAN 250 HD GEN SET electrical generator?
Depends on the engine.
Onan no longer makes engines. But with the older ones it is hard to say. Both had very good engines. Some better than others. I would say Kohler had the better single cylinder engine after Onan stopped making the LK. Onan had better RV generator engines. On the larger units they were both the same in quality and support.
Depends on what fuel you are burning
Should be 110 PSI
That engine holds 1.75 quarts with filter change.