New sparkplug for lawn mower?

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Just replace with a Champion J19LM (non resistor). NGK's are Ok too but I like Champions for small engines. An iridium plug will not make any difference in performance. Unless they are fouled, plugs last for many years with an ocassional regap.
 
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Lawn mowers run so few hours that plug wear isn't an issue, but you do need a spare on hand because they can suddenly stop working due to an internal break. I've never seen a platinum or iridium made in the short form for flathead engines.
 
yup Champion is the champion of small engines. You might hear a bunch of noise about champion car/truck engine plugs being no good but I think that is more myth than reality. Been using champion plugs forever in mower engines with no issue.
 
mk378 said:
Lawn mowers run so few hours that plug wear isn't an issue, but you do need a spare on hand because they can suddenly stop working due to an internal break. I've never seen a platinum or iridium made in the short form for flathead engines.
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There are iridiums that cross to the copper plugs, but I don't see a reason to use them. Lawn mowers and small engines don't wear out spark plugs like a car would, instead the plugs fail internally from constant heat cycles, vibration, etc, or they get fouled.
 
jeepman3071 said:
There are iridiums that cross to the copper plugs, but I don't see a reason to use them. Lawn mowers and small engines don't wear out spark plugs like a car would, instead the plugs fail internally from constant heat cycles, vibration, etc, or they get fouled.
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Yeah, I replace mine once a year, which is about 100-150 hours.
 
slybunda said:
was looking for a new spark plug for my flymo push mower with briggs and stratton motor (flymo quicksilver 46s) and saw the plug is too expensive here:
https://www.espares.co.uk/product/es954220/sgo001-petrol-lawnmower-spark-plug

got the part number which is Champion RJ19LM or NGK BR2-LM.

anyone know if there is an iridium variant for this application?
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Honestly in most Lawnmowers almost any plug would work You could buy a cheap one and take your chances. I have a hard time pay $27 #'s for a spark plug!

FWIW I use E3 spark plugs in all my OPE. I have good luck with them and they last several years. I usually change them long before I have an issue. According to the E3 site you need an E3.10. Link to cross reference is -> here

just my $0.02
 
My Last Snowblower factory sparkplug lasted 21 years, Tecumseh 8hp SK engine ran fine, plug was fine.
Auger housing rusted out, So I should have been handier with a can of Rust-Oleum in the Spring :)

Just as a reference point of interest, manufacturer's issuing a recommended service interval of 30K miles on a road going motorcar would be in operation for ~ 1000hours
I estimate I ran my snowblower for less than 400 hours in 21 years.
 
In the last 5 yrs of fixing and flipping push mowers, the last 4 years I stopped buying new plugs. Just clean the carbon off, gap correctly, and re-install.
 
I am still using the original plug that came with my Toro when I bought it new in 2010. The Briggs flat head runs strong and always starts. Change the oil, not the plug.
 
fozzdesy2001 said:
I am still using the original plug that came with my Toro when I bought it new in 2010. The Briggs flat head runs strong and always starts. Change the oil, not the plug.
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Me too. I inspect the spark plug gap every spring & adjust as required. So far, B&S mower has been trouble free since I bought it in 2012.
 
Can you get an E3 spark plug in the UK? On my Stihl trimmer and my 10-year-old lawn machines I get longer run time on the same tank of fuel
 
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