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#4707782 - 03/26/18 06:51 PM Spark Plug Change Interval
Astro_Guy Online   content


Registered: 07/30/15
Posts: 453
Loc: Pennsylvania
Some OPE, particularly B&S powered, call for a 50 hour spark plug change. Others suggest clean and gap at 100 hours, with no specific change interval. What's up with that? 50 hours seems ridiculous. Your opinions please.

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#4707785 - 03/26/18 06:56 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
Alex_V Offline


Registered: 04/10/16
Posts: 1174
Loc: Campbellsville, KY
Whenever it shows wear or affects performance.
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#4707802 - 03/26/18 07:23 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
Warstud Offline


Registered: 09/02/05
Posts: 5493
Loc: MIchigan
Keep a spare on hand in case you start to have issues. Then put in the new one and if that doesn't solve the issue put the old one back in.

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#4707838 - 03/26/18 07:54 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
spasm3 Offline


Registered: 05/30/10
Posts: 8763
Loc: North Carolina
I bought plugs for my kawsaki fr651v engine as the manual said clean and regap at 100 hours. Though i would just replace. When i pulled them the gap was between .030 and .40. Ground and center electrode hardly worn, so i put them back in. They look like they can easily go another 100hrs.
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#4707894 - 03/26/18 08:36 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Clean and regap every 100 hours.

it is a RARE event I change a spark plug out
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#4707918 - 03/26/18 09:06 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
Crispysea Offline


Registered: 04/14/17
Posts: 417
Loc: TN USA
I almost never change plugs on my OPE. I just changed it on my trimmer after almost ten years! It was getting hard to start. It probably had 100 hours on it.

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#4707985 - 03/26/18 10:17 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
old1 Offline


Registered: 01/04/11
Posts: 1006
Loc: Columbus Nebraska
I have never seen a plug on OPE actually WORN out. Not working, yes, but not wore out. I have seen plugs many many years old and working perfect, and ones practically new go bad.
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#4708479 - 03/27/18 12:54 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
boraticus Offline


Registered: 04/19/09
Posts: 2929
Loc: Canada
I pull the plugs on OPE once ever couple years or so to see how the fuel is burning. Then I clean & gap them and put them back. Some have over 1000 hours on them and I suspect will have well over twice that before I replace them. A plug usually has to fail before I'll change it. I keep spares on hand just to be on the safe side.

Manufacturers always tell you to replace parts for one primary reason: TO SELL PARTS!


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#4708741 - 03/27/18 06:00 PM Re: Spark Plug Change Interval [Re: boraticus]
Astro_Guy Online   content


Registered: 07/30/15
Posts: 453
Loc: Pennsylvania
Originally Posted By: boraticus
Manufacturers always tell you to replace parts for one primary reason: TO SELL PARTS!

Yeah - echo that. I ordered a couple of NGK Iridium plugs to keep on hand. The Honda push mower refused to start last weekend, so I will try one in that machine. That one has the original plug with several hundred hours on it. I've never cleaned or gapped it. It looks like the perfect candidate for testing a new plug.

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#4708841 - 03/27/18 07:36 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
Bluestream Offline


Registered: 09/13/03
Posts: 5758
Loc: Waterloo, ON
My Honda OPE is over 30 years old, original plugs in all. Just file and gap when they get worn


Edited by Bluestream (03/27/18 07:38 PM)
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#4708918 - 03/27/18 08:51 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
bubbatime Offline


Registered: 03/18/08
Posts: 5720
Loc: South Florida
I used to change em every two or three years, just to have a shiny new pug in there. Now I just leave them alone. If it starts and runs, that's good enough for me. I might re-gap it every half decade. Maybe.
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#4710806 - 03/29/18 06:53 PM Re: Spark Plug Change Interval [Re: Astro_Guy]
JLawrence08648 Offline


Registered: 01/20/17
Posts: 253
Loc: NJ
I wish on snowblowers and mowers, repair and sale of used. Never replace a spark plug unless it doesn't work which is years and years.

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#4711232 - 03/30/18 08:41 AM Re: Spark Plug Change Interval [Re: Astro_Guy]
Tundragod Offline


Registered: 06/14/11
Posts: 180
Loc: MN
My troy Bilt snow blow says "Service the Spark Plug After every season or 100 Hours". Seems excessive but a plug is only about $2.......
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#4711305 - 03/30/18 09:34 AM Re: Spark Plug Change Interval [Re: Astro_Guy]
Eddie Offline


Registered: 12/07/03
Posts: 9643
Loc: Florida, Cape Coral
My B&S 20HP twin says 50 hours on spark plugs. I pull them at 50 and they look very good. I clean with a fiber brush, check gap and reinstall. ed
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#4711369 - 03/30/18 10:11 AM Re: Spark Plug Change Interval [Re: JLawrence08648]
boraticus Offline


Registered: 04/19/09
Posts: 2929
Loc: Canada
Originally Posted By: JLawrence08648
I wish on snowblowers and mowers, repair and sale of used. Never replace a spark plug unless it doesn't work which is years and years.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4700105/2/Generator_Maintenancerous


If all you own is a single cylinder lawn mower, the cost is insignificant. When a person has numerous machines with multiple plugs, the cost becomes a factor.

Not sure what plugs you're buying for $2.00. We pay over $5.00 for an NGK up here.

Regardless of the cost, why would anyone want to throw out a perfectly functioning part simply because the "manual says to"? Does that make any sense whatsoever?

Manufacturers love people who follow instructions without thinking about what they're doing.

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