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Changing Spark Plugs
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For consistent, easy starting, change your spark plug every 100 hours or every season, whichever comes first. Replacing your spark plug:

  • Ensures consistent spark
  • More reliable starting
  • Improves fuel economy

Step 1: Remove existing spark plug

1. Disconnect the spark plug lead. Then, clean the area around the spark plug to avoid getting debris in the combustion chamber when you remove the plug.

2. Remove the spark plug using a spark plug socket.

3. Clean light deposits from the plug with a wire brush and spray-on plug cleaner. Then, use a sturdy knife if necessary to scrape off tough deposits. NOTE: Never clean a spark plug with a shot blaster or abrasives.

4. Inspect the spark plug for very stubborn deposits, or for cracked porcelain or electrodes that have been burned away. If any of these conditions exists, replace the spark plug.

Step 2: Put in new spark plug

1. Use a spark plug gauge to measure the gap between the two electrodes (one straight, one curved) at the tip of your spark plug Many small engines require a .030" gap. Check for the specifications for your model.

2. If necessary, use a spark plug gauge to adjust the gap by gently bending the curved electrode. When the gap is correct, the gauge will drag slightly as you pull it through the gap.

3. Reinstall the plug, taking care not to over-tighten (15 ft. lbs. MAXIMUM ). Then, attach the spark plug lead.

I own a Briggs & Stratton 550 E and I bought it last year.  I pulled the plug out and it looked dirty so I replaced it with the exact same one gaped at 30.  It has fuel and oil and won't start.  Any Ideas?  I am getting fuel in the chamber

Asked by: Bsquared96
It could be dirty fuel in the carburetor. You will want to check the carb and clean it. Here is a link that will help you:
Answered by: Nicole_BriggsStratton
Date published: 2014-04-22

I have a Craftsman rotary lawn mower. 550 Series Briggs & Stratton Engine. Model # 917.388461. I need assistance on finding a replacement spark plug wire for it. Where can I go to find this? Is it known as a different part name? What is the part number?

Asked by: Willy1988
To locate any information on your engine, you will first need the model type and code. Please see the following FAQ for assistance in locating these numbers: Once you have this information you can find information on your engine here: Select engine as your product type and follow the directions for entering the model type and trim into the search fields.
Answered by: Nicole_BriggsStratton
Date published: 2014-04-14

I have a E550 and it is not starting. Oil is good, Gas is new. When I pull the cord it sounds like it is wanting to turn over. It was the first time this year I tried. Could it be the spark plugs? IF so do how do I get to them? 

Asked by: Bbills
It could be the spark plug. The spark plug is beneath the black rubber boot. Then you will need to use a spark plug wrench or an adjustable wrench to remove the plug.
Answered by: Nicole_BriggsStratton
Date published: 2014-04-10

What is the spark plug for a 5HP engine model #12447-02-3116-02 and for a 40cc engine model #021132-0599-E1

Asked by: Elpepe
The spark plug for model 124702-3116-02 is part# 796112S and for model 021132-0599-E1 is part# 696876.
Answered by: Nicole_BriggsStratton
Date published: 2014-04-10

I can't start the mower for the first time this year - pulled out the spark plug, and it is quite oily? Doesn't seem right to me. Also checked the fuel line, gas getting to the carb ok. Air filter slightly dirty but not too bad.

Asked by: gavsy19
Oil on the plug indicates either the unit was tilted and oil got into the combustion chamber or one of the piston rings is bad.
Answered by: Nicole_BriggsStratton
Date published: 2014-04-07

What spark plug do I need for a 5HP Engine Model 130202 0365 02? Will a Champion RJ19LM do the job? Doing the search on your website produces no results. Many thanks~~Alan

Asked by: Alanproch
You can use a 796112S or a Champion RJ19LM.
Answered by: Nicole_BriggsStratton
Date published: 2014-04-01

Which spark plug replaced the Champion CJ8

Asked by: Rich1
You can use a Briggs & Stratton part # 796122S or a Champion brand RJ19LM.
Answered by: Nicole_BriggsStratton
Date published: 2014-03-26

What is the spark plug gap for Champion CJ8Y for my Snapper Snow Thrower model 3203

Asked by: WLT1
The spark plug gap is .030"
Answered by: Nicole
Date published: 2014-03-22

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