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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14923
Experience:  Certified on Onan and Generac generators
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Onan 5000 marquis gold generator starts and runs but began

Customer Question

onan 5000 marquis gold generator starts and runs but began backfiring to the extent of causing the two piece intake manifold to seperate enough to see fire coming out of the failed silicone gasket. i removed the intake manifold and repaired it by drilling four of the pins out and replacing them with machine screws and nuts. thinking that repairing the big vacuum leak would address the backfiring, i reinstalled the generator into the motorhome, but the backfiring starts as soon as the second ac unit is turned on. the engine runs smooth until the governor tries to compensate for the additional load. carburetor is very clean inside and no deposits. magneto cause such symptoms?
Submitted: 1 year ago.
Category: Small Engine
Expert:  Hank F. replied 1 year ago.

No, a magneto will not cause that.

That is valves or carburetor.