What’s the best spark plug replacement for my Generac GP6700E generator?

[NavyVet88]

According to the manual, the part number for the factory plug is 0J00620106. Is the NGK 5534 the best replacement?

I’ve read several threads here pertaining to generator maintenance and lots of folks have said that NGK plugs were the best way to go. My generator is only about a month old right now with just 3.5 hours on the clock so I’m still working on the oil break-in at this point and was wondering if I should throw a better plug in it already.

Edit: if the NGK 5534 is gtg, I’ll grab one at Oreillys when I buy the next quart of oil for the break in change at 7 hours.

 

[slacktide_bitog]

That is a good choice, but NGK 4055 would be even better, and O'Reilly should carry it too

 

[NavyVet88]

That is a good choice, but NGK 4055 would be even better, and O'Reilly should carry it too

Out of curiosity, why is it better?

 

[slacktide_bitog]

Out of curiosity, why is it better?

It is iridium, so it will last much longer, and the thinner electrode requires less voltage

 

[NavyVet88]

It is iridium, so it will last much longer, and the thinner electrode requires less voltage

Thank you!

 

[benjamming]

No need to change the plug so early though.

 

[NavyVet88]

No need to change the plug so early though.

Yeah for sure. I’m just a hope for the best and prepare for the worst kind of guy. Having a spare plug and air filter with an extra quart of oil type of thing.

 

[ka9mnx]

It is iridium, so it will last much longer, and the thinner electrode requires less voltage

Non issue. The only reason for exotic plug materials is spark plug longevity.

 

[Astro_Guy]

It is iridium, so it will last much longer, and the thinner electrode requires less voltage

I will second the motion for Iridium. All of my 4-cycle OPE has Iridium plugs.

 

[spasm3]

I run iridium in my generators. Long life, and they start great.
Might outlast the generator.
I use ngk BPR6EIX.
I gap it at .028 don't use a coin gapper!!! Wire gapper only, or feeler.

 

[Propflux01]

No need to change the plug so early though.

If it's one of those "torch" brand plugs, then yes, it needs to be changed.

 

[repairman54]

2x on using them in a gen set. Got them in my current Generac, most likely a one and done. Never touched them again in 12 yrs. in my old house's Generac.

 

[ka9mnx]

I use copper plugs. The gen set is on a set for the last 15 years. Runs once a month, three days after Mathew and on occasional power outages. Garden tractor has about 20 years. Take them out and still look almost new. Even have them in my vehicles. The thing that killed exhaust systems and spark plugs was leaded gas.

 

[NavyVet88]

I use copper plugs. The gen set is on a set for the last 15 years. Runs once a month, three days after Mathew and on occasional power outages. Garden tractor has about 20 years. Take them out and still look almost new. Even have them in my vehicles. The thing that killed exhaust systems and spark plugs was leaded gas.

I ordered a four pack of the copper 5534’s online today. I forgot to update the post so my apologies. I’ll install one at the next oci l.

 

[Japanese]

I ordered a four pack of the copper 5534’s online today. I forgot to update the post so my apologies. I’ll install one at the next oci l.

Here are the specs of the plugs you ordered. The gap should be .031" and they are good for 30K miles. It doesn't show hours.
https://www.ngk.com/ngk-5534-bpr7es-nickel-spark-plug

Although, iridium spark plugs have the best longevity, copper plugs have the best spark. That's why racing plugs are always copper. I wouldn't use iridium plugs on equipment (including motorcycles) that are speced for copper plugs. Just replace them after certain hours, as mentioned in the owner's manual.

 

[slacktide_bitog]

Here are the specs of the plugs you ordered. The gap should be .031" and they are good for 30K miles. It doesn't show hours.
https://www.ngk.com/ngk-5534-bpr7es-nickel-spark-plug

Although, iridium spark plugs have the best longevity, copper plugs have the best spark. That's why racing plugs are always copper. I wouldn't use iridium plugs on equipment (including motorcycles) that are speced for copper plugs. Just replace them after certain hours, as mentioned in the owner's manual.

Non issue. The only reason for exotic plug materials is spark plug longevity.

Not exactly

The thinner electrodes on iridium also allows for easier start and possibly better fuel economy. In a lawn lower, for example, or anything with recoil start where you have to pull the cord, you will definitely notice easier starting with iridium.

 

[martinq]

Which fuel are you running?

 

[NavyVet88]

Which fuel are you running?

Non ethanol

 

[ka9mnx]

Not exactly

The thinner electrodes on iridium also allows for easier start and possibly better fuel economy. In a lawn lower, for example, or anything with recoil start where you have to pull the cord, you will definitely notice easier starting with iridium.

Unless you can support your theories, I think the difference in quicker starts is in the noise. The very minor difference in fuel economy might be because of less spark shrouding in the combustion chamber with iridium spark plugs. Again, in the noise.

I'll stick with the theory of longer plug life. 100k miles versus 30k miles between plug changes.

 

[slacktide_bitog]

Unless you can support your theories, I think the difference in quicker starts is in the noise. The very minor difference in fuel economy might be because of less spark shrouding in the combustion chamber with iridium spark plugs. Again, in the noise.

I'll stick with the theory of longer plug life. 100k miles versus 30k miles between plug changes.

The longer life is also true. There is more than one reason