How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14675
Experience:  Certified on Onan and Generac generators
19372534
Type Your Small Engine Question Here...
Hank F. is online now
A new question is answered every 9 seconds

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: 9 months ago.
Category: Small Engine
Expert:  Hank F. replied 9 months ago.

No, a magneto will not cause that.

That is valves or carburetor.