Changing the Spark Plugs of a Lawn Mower

Views: 10127 | Last Update: 2008-07-10
Changing the spark plugs of a lawn mower is an important part of maintenance, get expert tips and advice on lawn mower repair & maintenance in this free video. View Video Transcript

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Peter Gutwein

Video Transcript

Hi, my name is Peter Gutwein and today we’re talking about some basic repairs on a mower, some common problems you might come up on. Next step would be after the air filter and the sharpening the blades and the oil would be the spark plug. So what you can do here is you could see that the spark plug comes right out of the front of the mower, that’s real common. Every once in a while you’ll see it out of the side but 90% of the time it comes out right in the front of the mower right here. So what you want to do is you want to go ahead and get your spark plug boot off and you just give it a nice tug and sometimes they’re a little tight but just give it a nice tug, you can use some pliers if your careful, if it’s just being real stubborn. This one is a 13/16 spark plug so you just put it on there and then we just pop it, I use the pop technique because it is aluminum and that’ll free it up a lot easier than just huffing on it. So then you can pull it out, this spark plug has obviously been in there for a long time, it’s pretty dirty around the outside there but you can see that it was firing. A lot of times people change a spark plug because their mower doesn’t start and the first thing they blame it on is a bad spark plug and I would say that that’s not the problem most of the time but it is something that needs to be changed every year. So let me go ahead and get a new plug here, you can pick up a plug at a lawnmower shop, even a auto part store most the time has plugs that you need. This one particular more take an RJ19LM, that’s a champion number but there are other brands that you can use. So you just start it by hand, tighten it up on there and then you just put your wrench on there, you don’t want to huff on it real tight, you just want to get it pretty snug to get that crush washer so that it’s nice and tight and then just install your spark plug boot and that’s how you change a spark plug on a mower.