Are you looking for a new spark plug for your Honda generator but have no idea how to choose one? I have great news for you! Our team here at Generatorist has helped over 600,000 visitors find information about generators and we will help you as well.
Data for this page is based on official manuals from Honda. We will show you the type of spark plug for specific models of Honda generators, the gap size, alternatives, cross reference charts and links to manuals. We also provide references where you can verify this info for yourself.
Just click on your model to see the specifications and have a 5/8″ (16mm) or 13/16″ (21mm) socket & ratchet at hand.
Honda Generators
Spark plug (info from the User’s Manual)
- Type – LR4C-E (NGK) or equivalent
- Gap – 0.024″– 0.028″
- Socket size – 5/8″ (16mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/LR4CE
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – LR4C-E (NGK) or equivalent
- Gap – 0.024″– 0.028″
- Socket size – 5/8″ (16mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/LR4CE
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=WlKUwAgRhpc
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=WlKUwAgRhpc
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=WlKUwAgRhpc
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Official part number – 98056-55777
- Gap – 0.024″– 0.028″ (0.6-0.7mm)
- Socket size – 5/8″ (16mm)
Video – https://www.youtube.com/watch?v=zfR1ikN_HZM
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com/pe/pdf/manuals/31Z07610.pdf
Spark plug (info from the User’s Manual)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR5ES (NGK) / W16EPR-U (DENSO) or equivalent
- Official part number – 98079-55846
- Gap – 0.028″– 0.031″ (0.7-0.8mm)
- Socket size – 13/16″ (21mm)
Video – https://www.youtube.com/watch?v=ZPlFUNA2dYM
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) / W20EPR-U (DENSO) or equivalent
- Official part number – 98079-56846
- Gap – 0.028″– 0.031″ (0.7-0.8 mm)
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR5ES (NGK) / W16EPR-U (DENSO) or equivalent
- Official part number – 98079-55846
- Gap – 0.028″– 0.031″ (0.7-0.8mm)
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – https://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Official part number – 98079-56846
- Gap – 0.028″– 0.031″ (0.7-0.8mm)
- Socket size – 13/16″ (21mm)
Video – https://www.youtube.com/watch?v=Rv2O5Eg8hR8
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Replacement parts – https://cdn.powerequipment.honda.com/pe/pdf/manuals/otr54654.pdf
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Video – https://www.youtube.com/watch?v=Rv2O5Eg8hR8
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – https://www.equipcoservices.com/pdf/manuals/honda_em2500.pdf
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – https://www.equipcoservices.com/pdf/manuals/honda_em2500.pdf
Spark plug (info from the User’s Manual)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – https://www.equipcoservices.com/pdf/manuals/honda_em3500.pdf
Spark plug (info from the User’s Manual)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR5ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – CR5HSB (NGK) or equivalent
- Gap – 0.024″– 0.028″
- Socket size – 5/8″ (16mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/ngk_pn/cr5hsb
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR6ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR6ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – BPR5ES (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 13/16″ (21mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/BPR5ES
Owner´s manual – http://cdn.powerequipment.honda.com
Spark plug (info from the User’s Manual)
- Type – ZFR5F (NGK) or equivalent
- Gap – 0.028″– 0.031″
- Socket size – 5/8″ (16mm)
Alternatives – https://www.sparkplug-crossreference.com/convert/NGK_PN/ZFR5F
Owner´s manual – http://cdn.powerequipment.honda.com
Is your generator missing from the list?
Feel free to check out the Honda website in case you didn’t find your generator on this list.
Symptoms of a Bad Spark Plug
Are you thinking about replacing your current spark plug? There are some universal signs you need to look for:
- Your generator won’t start at all
- The generator needs repeated attempts to start properly
- The generator misfires
- Fuel consumption is noticeably increased
- There are deposits and a buildup of residue on your spark plug
- The spark plug is damaged
Are there any deposits? You need to remove the spark plug with a proper tool, clean it using a small knife and make sure that it is gapped properly. You can find the ideal gap size on the list above.
Changing Spark Plug on Your Generator
Here is a quick overview of our 7-step guide to replacing the spark plug in your generator:
- Make sure the power switch on your generator is off and all power cords are unplugged from it. Also, ensure the surface of the machine is not too hot, and wear protective gloves and glasses.
- Locate the spark plug by following the black cable connected to the engine and ending with a boot.
- Remove the wire that is connected to the old spark plug by grabbing onto the boot firmly, twisting it, and pulling it off at the same time.
- Clean the area around the old plug to avoid any debris, dirt, or oil residue from falling into the engine.
- Remove the old plug using the correct spark plug socket and a ratchet. Use the ratchet only to make the spark plug loose and then remove it by turning the socket manually.
- Check the new spark plug for the correct model, size, and gap using a gap measuring tool.
- Install the new spark plug by inserting it into the empty spark plug socket and placing it into the empty socket on your engine. Tighten the spark plug with a ratchet, being careful not to overdo it, and remove both the ratchet and the spark plug socket.
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Matthew Gerther
Founder, Generator enthusiast
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1 thought on “Honda Generators Spark Plug Gap & Socket Size Guide”
I am running a honda gx390 on Natural Gas and sometimes find it hard to start. What Spark plug and gap should I be using? Should gap for NG be different than for gas?