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What spark plugs are you running in your mowers? #5426827 05/11/20 09:07 PM
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RazorsEdge Offline OP
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I've currently got a E3 plug in the 4-stroke Briggs and Stratton 500cc lawn tractor.

https://www.amazon.com/E3-Spark-Plug-E3-20-Garden/dp/B000BPQGQ6


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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5426862 05/11/20 09:55 PM
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Imp4 Offline
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An RJ19LM can be had for a few dollars and is perfectly suited for the job.
Wally's sells the Autolite equivalents for $1.99, also perfectly serviceable for the job at hand.
Why pay $8 for an E3???

Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5426863 05/11/20 09:55 PM
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Skol8480 Offline
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I always have used Champion plugs in OPE, strictly out of convenience and I've never had a problem. I'm considering trying NGK just to try something different after all these years.

Re: What spark plugs are you running in your mowers? [Re: Imp4] #5426872 05/11/20 10:05 PM
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Originally Posted by Imp4
An RJ19LM can be had for a few dollars and is perfectly suited for the job.
Wally's sells the Autolite equivalents for $1.99, also perfectly serviceable for the job at hand.
Why pay $8 for an E3???


The E3 has been in this mower for years now. We bought it used so don't know exactly how old the spark plug is,but it runs great.


wink


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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5426881 05/11/20 10:16 PM
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slacktide_bitog Offline
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My lawn mower has the NGK BR2-LM

NGK makes the best spark plugs smile

Autolite is the only company that makes iridium spark plugs for small engines. The part number for this application is XST458. This would be my second choice after NGK

Re: What spark plugs are you running in your mowers? [Re: slacktide_bitog] #5426888 05/11/20 10:36 PM
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Originally Posted by slacktide_bitog
My lawn mower has the NGK BR2-LM

NGK makes the best spark plugs smile

Autolite is the only company that makes iridium spark plugs for small engines. The part number for this application is XST458. This would be my second choice after NGK







Yeah I'm going NGK most likely after this summer, but was curious as to what else people are using. cool


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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5426893 05/11/20 10:51 PM
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oldhp Offline
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Remember the Champion "One tug plug" for OPE's? They have a smaller center electrode. They call them EZ Start now-a -days. I have one that's at least 10yrs old in my Murray 3.5HP push mower.


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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5426973 05/12/20 04:37 AM
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dlundblad Offline
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Whatever factory is.

I think my 2 stroke LB has a Champion? Not sure on my Briggs. Haven’t changed it yet. laugh


03 Jeep WJ 4.0 208k
02 Volvo S60 2.4T 199k
97 Chevy Blazer 4.3 175k
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Re: What spark plugs are you running in your mowers? [Re: Imp4] #5426990 05/12/20 05:58 AM
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Slick17601 Offline
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Originally Posted by Imp4
An RJ19LM can be had for a few dollars and is perfectly suited for the job.
Wally's sells the Autolite equivalents for $1.99, also perfectly serviceable for the job at hand.
Why pay $8 for an E3???


+1


2018 RAM Bighorn 5.7
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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427022 05/12/20 06:47 AM
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Ngk bpr4es in my Ferris stand in rider. Kawasaki engine.has the best luck with Champion ez start in a Duraforce 2 stroke Lawn-Boy vs the original NGK plug.


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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427024 05/12/20 06:48 AM
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I generally use what the OEM recommends. The OEM I worked for actually did testing with different plugs and brands to see which the engine ran best on, if any. Perhaps they don't all do this, or do this anymore, I don't know.

The only exception is flat head engines. The small Briggs I have I use narrow electrode plugs. We tested them at work and eventually recommended narrow electrode plugs for flat heads. They concentrate the spark, which helps low compression, volumetrically-inefficient engines combust. They start easier & faster, and run smoother.

I wouldn't use coated electrodes - the purpose of coating is to make them last longer (less metal transfer across electrodes). The coating isn't as electrically-conductive as the base metal of the electrode, usually a copper alloy. Coated electrodes are targeted at high hour use engines such as automotive engines that have high voltage ignition systems that can power through the coatings. A small engine may not run as well on them, plus you don't put the hours on them like you do with a car, so you spend more money to make your little engine run worse, and it's only one or two spark plugs anyway.

In fact, the Gen III Ram HEMI engine originally had to use uncoated spark plugs that had to be changed every 30,000 miles because Chrysler didn't put on a big enough coil pack to fire the 2 plugs per cylinder needed to meet EPA exhaust emissions! They since put in bigger coils and now use coated plugs for 100,000 intervals. I change at 50,000 miles - they get fairly pitted by 100,000. I ran both engines. It cost $300 to change plugs!!!



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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427028 05/12/20 06:51 AM
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Champion J19LM, J8C and H-10's. I never had a problem with any of them. I stock up cheaply when my favorite drug store has them on sale.

Last edited by Lubener; 05/12/20 06:54 AM.

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Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427052 05/12/20 07:18 AM
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NGK.


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2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427061 05/12/20 07:28 AM
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The old Champion J19LM. Fits basically all of my OPE and does the job at a low price. No need for any fancy metals, etc... Cheap, available, and meets the OEM requirements.

Re: What spark plugs are you running in your mowers? [Re: RazorsEdge] #5427074 05/12/20 07:48 AM
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my 40 year old lawnboy still has the OE CJ14 plug, it probabaly has at least 1000 hours on it after 40 years. I have not had it our in about 3 years. Still starts on the second pull like all F series engines I have had.

My 10 year old kohler courage has its original plug too. 247 hours last I checked.

Rod

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