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Platinum or Iridium Plugs for OPE? #4697774 03/17/18 04:19 PM
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Astro_Guy Offline OP
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Somewhere within the next 4-5 weeks all of the lawn toys are going to come out of hibernation. Four machines haven't seen a new spark plug in three or more years, including two Honda GCV-160, one Chonda in the generator, and a 22 HP Briggs V-Twin in the lawn tractor. Given that the difference in spark plug prices is not that much and the time to replace them is the same, are there any strong reasons for or against upgrading the plugs? Is there any reason not to throw a couple of extra bucks at these plugs?

Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4697780 03/17/18 04:25 PM
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spasm3 Offline
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My zero turn kawasaki engine hit 100 hours, so i bought replacement spark plugs. When i took the old ones out , the looked unworn. I put them back in.

I'm not sure about 2 cycle, but i'm not sure you need anything more than standard non platinum plugs.


13 elantra 81k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 17000 miles synpwr 5w30
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4697781 03/17/18 04:26 PM
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How old are you? If you put in platinums that might be the last change you ever have to do. Iridium would be way over the top. Hey, but we’re all OCD on this forum.

Last edited by Snagglefoot; 03/17/18 04:28 PM.

If you want the job done right......do it yourself.
Re: Platinum or Iridium Plugs for OPE? [Re: spasm3] #4697785 03/17/18 04:29 PM
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Astro_Guy Offline OP
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Originally Posted By: spasm3
My zero turn kawasaki engine hit 100 hours, so i bought replacement spark plugs. When i took the old ones out , the looked unworn. I put them back in.

I'm not sure about 2 cycle, but i'm not sure you need anything more than standard non platinum plugs.

Thanks spasm3! That was my suspicion as well, but I am tempted to try this in at least one machine, possibly the one with the V-Twin. OTOH, the generator with the Chonda motor is the one that I really care about starting when needed.

Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4697797 03/17/18 04:52 PM
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Trav Offline
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I switched everything to iridium except the lawnmower and that small plug is a B&S platinum.
I have some observations that may help you decide, nothing scientific.

My wife could not start the lawnmower ever, I had to start it. With the platinum plug she can start it first pull, same mower, same oil only the plug being different. The precious metal plugs require much lower voltage to fire, that the explanation.

The snowblower does exactly the same route every storm, again same oil (changed yearly) nothing else different. For the first 8 yrs in a storm 4 inches or more I had to refill the tank about 3/4 through, it could never finish the job without.
With the iridium it completes the job easily even in a 20+ inch storm and is still not empty. If I had to guess its doing at least 30% better on fuel (I am not saying the results in a car engine will be the same).

This thing with its algore carb runs pig rich, if you idle it for a minute and throttle back up it blew lack smoke out, now it doesn't, it idles fine. I can only attribute this again to the lower firing voltage requirement of the plug with a magneto ignition. It always started first pull and never needed the 12V electric starter.

Before I got a gas fueled generator I noticed significant improvements in fuel economy with the gasoline powered one.


ASE L1, Master. Deutsch Meisterbrief.
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4697843 03/17/18 05:31 PM
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I wonder how/where do you find (proper) Iridium sparkplugs for OPE?

You can match/crossreference them from automotive use.....but then heat range is not right...

champion RJ19LM....no way that you get that as iridium smile


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Elf Evolution NF900 5W40
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4697891 03/17/18 06:05 PM
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The only reason platinum and iridium spark plugs are made is for vehicle engines that run hotter, leaner fuel mixtures
to meet emissions control requirements AND have a long service life while doing it!

Garden equipment applications simply can't push conventional plugs hard enough to make a difference!

Re: Platinum or Iridium Plugs for OPE? [Re: spasm3] #4697925 03/17/18 06:28 PM
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Linctex Offline
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Originally Posted By: spasm3
......... I bought replacement spark plugs.
When I took the old ones out, they looked unworn. I put them back in.


I never seem to wear out spark plugs in any OPE, either.

I have fouled a few in chainsaws over many years (27?) but never worn one out.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4698130 03/17/18 09:30 PM
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Iridium and forget about it!



Respectfully,

Pajero!


Always remember "Planned obsolescence."

1994 Montero SR 3.5 DOHC, 133,xxx
Fram Ultra/ Snorkel with Pre-filter
K-9-Co-pilot
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4698174 03/17/18 10:28 PM
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dwendt44 Offline
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Quote:
"I wonder how/where do you find (proper) Iridium sparkplugs for OPE?"


I tried to find a Iridium plug a couple of years ago and couldn't.
Found a similar number for an auto but the standard gap was .060 or
some such.
I ended up adjusting it down to what Briggs called for and it worked and
continues to work fine for several years now. Starts good runs good.

My 2˘


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy] #4698195 03/17/18 11:04 PM
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I find mine on eBay. Autolite Extreme Start.

http://www.autolite.com/products/lawn-and-garden.aspx

Last edited by Nyogtha; 03/17/18 11:06 PM.

"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: Platinum or Iridium Plugs for OPE? [Re: Trav] #4698493 03/18/18 09:35 AM
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lars11 Offline
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I have not tried iridium plugs on ope but you are stating that the plug change somehow improves fuel consumption in a snow blower. Since you are running it att full throttle and there is no feedback or connection between the ignition and carb that is simply impossible unless the plugs allows you to run it at lower RPM (which I doubt, did you reduce throttle?) The carb will feed exactly the same amount of fuel to the engine at a certain rpm regardless of plug. Unless you snowblower is equipped with a full ECM this is unreasonable and more likely a seat of the pants situation. Sorry, but that is likely it.
About the tarting though, that's interesting! MAybe I will try those plugs to ease starting!

Originally Posted By: Trav
I switched everything to iridium except the lawnmower and that small plug is a B&S platinum.
I have some observations that may help you decide, nothing scientific.

My wife could not start the lawnmower ever, I had to start it. With the platinum plug she can start it first pull, same mower, same oil only the plug being different. The precious metal plugs require much lower voltage to fire, that the explanation.

The snowblower does exactly the same route every storm, again same oil (changed yearly) nothing else different. For the first 8 yrs in a storm 4 inches or more I had to refill the tank about 3/4 through, it could never finish the job without.
With the iridium it completes the job easily even in a 20+ inch storm and is still not empty. If I had to guess its doing at least 30% better on fuel (I am not saying the results in a car engine will be the same).

This thing with its algore carb runs pig rich, if you idle it for a minute and throttle back up it blew lack smoke out, now it doesn't, it idles fine. I can only attribute this again to the lower firing voltage requirement of the plug with a magneto ignition. It always started first pull and never needed the 12V electric starter.

Before I got a gas fueled generator I noticed significant improvements in fuel economy with the gasoline powered one.

Last edited by lars11; 03/18/18 09:53 AM.
Re: Platinum or Iridium Plugs for OPE? [Re: Kamele0N] #4700494 03/20/18 08:29 AM
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Originally Posted By: Kamele0N
I wonder how/where do you find (proper) Iridium sparkplugs for OPE?

You can match/crossreference them from automotive use.....but then heat range is not right...

champion RJ19LM....no way that you get that as iridium smile


Actually the Autolite XST458DP Xtreme Start Iridium Spark Plug is a cross to the champion RJ19LM


Fear, uncertainty and doubt are excuses to do nothing!
Re: Platinum or Iridium Plugs for OPE? [Re: Trav] #4700924 03/20/18 03:46 PM
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Originally Posted By: Trav
My wife could not start the lawnmower ever, I had to start it. With the platinum plug she can start it first pull, same mower, same oil only the plug being different.


Thank you for that bit of info...now I'm thinking about getting one for my hard to start lawnmower that has no choke and seems to burn alot of gas. What brand of plug is it?

Re: Platinum or Iridium Plugs for OPE? [Re: smithph] #4701506 03/21/18 06:16 AM
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Originally Posted By: smithph

Actually the Autolite XST458DP Xtreme Start Iridium Spark Plug is a cross to the champion RJ19LM


No way that I can buy that in any OPE shop/service smile But tnx anyway...will look at ebay...internet etc...

Last edited by Kamele0N; 03/21/18 06:16 AM.

2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Elf Evolution NF900 5W40
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