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#4697774 - 03/17/18 05:19 PM Platinum or Iridium Plugs for OPE?
Astro_Guy Online   content


Registered: 07/30/15
Posts: 399
Loc: Pennsylvania
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?

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#4697780 - 03/17/18 05:25 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
spasm3 Online   content


Registered: 05/30/10
Posts: 8439
Loc: North Carolina
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.
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#4697781 - 03/17/18 05:26 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1303
Loc: Alberta
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.


Edited by Snagglefoot (03/17/18 05:28 PM)

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#4697785 - 03/17/18 05:29 PM Re: Platinum or Iridium Plugs for OPE? [Re: spasm3]
Astro_Guy Online   content


Registered: 07/30/15
Posts: 399
Loc: Pennsylvania
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.

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#4697797 - 03/17/18 05:52 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
Trav Offline


Registered: 11/20/06
Posts: 18257
Loc: MA, Mittelfranken.de
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.
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#4697843 - 03/17/18 06:31 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
Kamele0N Offline


Registered: 02/09/15
Posts: 1945
Loc: Slovenia
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
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#4697891 - 03/17/18 07:05 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 697
Loc: Canada

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!

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#4697925 - 03/17/18 07:28 PM Re: Platinum or Iridium Plugs for OPE? [Re: spasm3]
Linctex Online   content


Registered: 12/31/16
Posts: 5718
Loc: Waco, TX
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.
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#4698130 - 03/17/18 10:30 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
Pajero Offline


Registered: 05/05/12
Posts: 796
Loc: Rio Rancho, NM
Iridium and forget about it!



Respectfully,

Pajero!
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#4698174 - 03/17/18 11:28 PM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
dwendt44 Offline


Registered: 05/17/06
Posts: 3930
Loc: Central Wisconsin
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˘
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#4698195 - 03/18/18 12:04 AM Re: Platinum or Iridium Plugs for OPE? [Re: Astro_Guy]
Nyogtha Offline


Registered: 10/13/14
Posts: 2156
Loc: San Antonio, TX
I find mine on eBay. Autolite Extreme Start.

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


Edited by Nyogtha (03/18/18 12:06 AM)
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#4698493 - 03/18/18 10:35 AM Re: Platinum or Iridium Plugs for OPE? [Re: Trav]
lars11 Offline


Registered: 12/16/06
Posts: 968
Loc: Sweden
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.


Edited by lars11 (03/18/18 10:53 AM)

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#4700494 - 03/20/18 09:29 AM Re: Platinum or Iridium Plugs for OPE? [Re: Kamele0N]
smithph Offline


Registered: 02/07/08
Posts: 369
Loc: USA
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
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#4700924 - 03/20/18 04:46 PM Re: Platinum or Iridium Plugs for OPE? [Re: Trav]
Warstud Online   content


Registered: 09/02/05
Posts: 5202
Loc: MIchigan
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?

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#4701506 - 03/21/18 07:16 AM Re: Platinum or Iridium Plugs for OPE? [Re: smithph]
Kamele0N Offline


Registered: 02/09/15
Posts: 1945
Loc: Slovenia
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...


Edited by Kamele0N (03/21/18 07:16 AM)
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1997 Toyota Landcruiser KZJ95 3.0 TD various 10w40

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