Small Engine Spark Plug

[NETWizz]

A friend of mine has purchased a small generator from Costco. It's the Die Hard DHD2400iSCO

Basically as far as I can tell it should in theory be identical to my Yamaha EF 2200iS except with a CO sensor and over-rated to 2400 without actually probably being able to deliver more.

Anyway the spark plug it comes with is a Torch A5RTC

Any idea what plug you would recommend knowing that Torch is garbage?

I read that it translates to a NGK CR5HSA, which is just the screw on nut version of the CR5HSB I have in a couple Honda inverter generators taking the CR5HSB (nut welded). That said, my Yamaha I have uses a BRP6HS, which is much different than a CR5HSB by thread-size etc. What I am asking is how this makes sense because it would seem this is a Yamaha clone needing a Honda Plug.

I am not saying it makes sense. All I know is that it has an A5RTC plug. Clearly that is a Torch Heat Range 5 Resistor plug. Any ideas what to switch it to?

 

[Trav]

BPR6EIX (6637) is the NGK iridium equivalent. These fire and start easier, last much longer and saves fuel.

 

[spasm3]

BPR6EIX (6637) is the NGK iridium equivalent. These fire and start easier, last much longer and saves fuel.

Second this. I have that plug in 3 generators. Starts really easy, plug will probably outlast the generator.

 

[GaryMX5]

NGK would be my first choice as well but I have found Champion makes pretty good small engine plugs as well. Torch reliability is kind of hit or miss. My Ariens snow blower came with a Torch plug as standard equipment. I immediately bought a NGK replacement but dragged my feet installing it. Anyway, the torch worked just fine for two seasons (albeit limited use due to lean snow seasons). I finally changed it when I did some preseason maintenance, but it was working just fine when I did.

 

[TnT_M]

NGK or I use E3s in a lot of my OPE.

 

[6.7 CTD]

@NETWizz NGK plugs for sure, but check to ensure it’s the correct plug. I just recently ordered some NGK plugs from Rock Auto for my small Wen 2500 inverter generator. It came with a Torch A5RTC as well. NGK BPR6EIX plugs do not fit if it came with the A5RTC. (They do fit my Champion 8750 though, and I have one in it). The correct crossover plug for the Torch is the NGK CR5HIX (7120), but they don’t come with a terminal nut. I grabbed a few Denso terminal nuts.

 

[CleanSump]

First thing I did with last two mowers and pressure washer was pull the Torch plug and put in NGK or Denso before I ever started them.

 

[martinq]

Seeing as Champion seems unable to produce a plug with a concentric insulator / electrode to this very day, I cannot condone or recommend their use. NGK? Priceless!

The GP plugs (single platinum, G-Power) are well worth the money and offer notable improvements if available. Dual (laser) platinum, iridium or ruthenium are even better but you're into diminishing returns especially in a short life application like this.

 

[NETWizz]

Turns out this was a less stupid question before I physically got eyes on it the answer is pretty clear... Look at this sticker doh!

Many people here recommended the CR5HIX...

Now out of curiosity would an NGK CR7HIX be the most exact Iridium of the CR7HS on the sticker above?

 

[6.7 CTD]

The CR5HIX is hotter than the recommended CR7HS.

 

[Indestro]

Turns out this was a less stupid question before I physically got eyes on it the answer is pretty clear... Look at this sticker doh!


View attachment 331622



Many people here recommended the CR5HIX...

Now out of curiosity would an NGK CR7HIX be the most exact Iridium of the CR7HS on the sticker above?

Torch and a lot of the common Chinese generator manufacturers are odd companies in my opinion. They put out a lot of information (such as spark plug information) that is often inconsistent or just simply incorrect.

For example, the number "5" in Torch spark plug A5RTC means it has a heat rating of "5" (as per Torch). This is equivalent to the same heat rating of "5" in NGK spark plug names (as per Torch). You can see this information in a Torch Spark plug catalog linked below. So a NGK CR5HSB would probably be a better replacement (the "B" at the end of the NGK plug name means it has a fixed nipple). The difference might not be noticeable, but if you are on BITOG, you probably want to be a exact as possible. I would not blindly trust any of these information sources 100%. But hopefully this information is helpful to you.

https://weichaiamerica.com/images/literature/catalogs/catalog_sparkplug_torch.pdf

Indestro

 

[NETWizz]

Torch and a lot of the common Chinese generator manufacturers are odd companies in my opinion. They put out a lot of information (such as spark plug information) that is often inconsistent or just simply incorrect.

For example, the number "5" in Torch spark plug A5RTC means it has a heat rating of "5" (as per Torch). This is equivalent to the same heat rating of "5" in NGK spark plug names (as per Torch). You can see this information in a Torch Spark plug catalog linked below. So a NGK CR5HSB would probably be a better replacement (the "B" at the end of the NGK plug name means it has a fixed nipple). The difference might not be noticeable, but if you are on BITOG, you probably want to be a exact as possible. I would not blindly trust any of these information sources 100%. But hopefully this information is helpful to you.

https://weichaiamerica.com/images/literature/catalogs/catalog_sparkplug_torch.pdf

Indestro

I would not be surprised either that they use a hotter Torch plug to not have a misfire knowing that NGK will do better, but who knows.

 

[Japanese]

I read that it translates to a NGK CR5HSA, which is just the screw on nut version of the CR5HSB I have in a couple Honda inverter generators taking the CR5HSB (nut welded).

This is correct. The only difference between those plugs is the terminal
HSA - terminal type - Threaded Stud Thread Diameter
https://www.sparkplugs.com/ngk-7840-cr5hsa-nickel-spark-plug

HSB - terminal type - Solid
https://www.sparkplugs.com/ngk-6535-cr5hsb-nickel-spark-plug

Both plugs above have:
Thread Diameter 10mm
Pitch Thread 1mm
Hex Size for wrench 5/8" (16mm)

^ These two are the NGK replacement for Torch A5RTC.

That said, my Yamaha I have uses a BRP6HS

https://www.ngk.com/ngk-7022-bpr6hs-nickel-spark-plug
This plugs has:
Thread Diameter 14mm
Pitch Thread 1.25mm
Hex Size for wrench 13/16" (21mm)

This plug NGK BPR6EIX (6637) matches the specs of BPR6HS but won't fit machines that require HSA or HSB above.
https://www.ngk.com/ngk-6637-bpr6eix-iridium-ix-spark-plug

If the engine is a clone that doesn't mean that has the same spark plug.

 

[Japanese]

Now out of curiosity would an NGK CR7HIX be the most exact Iridium of the CR7HS on the sticker above?

Yes, it will be direct replacement. The plug dimensions are exactly the same, except the central electrode.
https://www.sparkplugs.com/ngk-7544-cr7hix-iridium-ix-spark-plug

 

[NETWizz]

Yes, it will be direct replacement. The plug dimensions are exactly the same, except the central electrode.
https://www.sparkplugs.com/ngk-7544-cr7hix-iridium-ix-spark-plug

Why is the Torch a 5 heat index but the NGK a 7 recommended ?

 

[Japanese]

Why is the Torch a 5 heat index but the NGK a 7 recommended ?

The heat range numbers are different for each company. They don't correspond to one another (image below).
Torch 5
Champion 10
Bosch 24
NGK 7
It looks like those are the same heat range plugs just designated with different numbers according to each company's catalog standards.

 

[NavyVet88]

Torch is saying in that pic:

“Hey, we suck and here’s proof”.

 

[NETWizz]

Okay CR7HIX for the Die Hard gen, BPR6EIX for the genuine Yamaha, and for Honda CR5HIX… I just need to ensure I have the screw on spark plug nut

 

[Silverado12]

FWIW Champion is my go-to spark plug for small engines.

 

[martinq]

FWIW Champion is my go-to spark plug for small engines.

Please let me know if they found a way to make their plugs "straight". Almost every one I see has the center electrode off-center. I will not use a crooked plug when NGK knows how to do a good job reliably.