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Thread: Onan Gen HGJAB What is the best spark plug and gap?

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    Junior Member
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    Onan Gen HGJAB What is the best spark plug and gap?

    I have been working on my gen now for about 8 hrs. Changed oil, oil filter, and air filter and fuel filter. What is the best plug to put in the gen. Mine has the NGK's already in it but had bad gas so clogged everything up. Not sure if they are the right cross over plug. Does anyone know the correct original champion plug number? Also what is the the correct gap on the plugs? TIA, Ultra

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    Senior Member brianharrison's Avatar
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    Re: Onan Gen HGJAB What is the best spark plug and gap?

    Gap is 25 thou inch - link here, page 29.

    Have not found the OEM spark plug - but it shows as resistive type.

    Brian
    Tow: 2008 F350 6.4L King Ranch Crew 4x4 SRW, H&S Tuner, AFE 4" Exhaust DPF delete, Ride-Rite, 51 gal underbed Titan tank SOLD
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    Junior Member
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    Re: Onan Gen HGJAB What is the best spark plug and gap?

    Spark plug is NGK BPR4EY


    Torque to 18 ft-lb

    Gap: 0.025

    I have the service manual for this gen set in electronic form if you need it.

    Sean

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