Small Engine Repair: How to Gap a Spark Plug



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**Always follow the instructions in your repair manual when doing repair or maintenance work on Outdoor Power Equipment. Manuals can be found at the manufacturers website.**

In this video I show how to gap a spark plug using a variety of spark plug gapping tools. Most spark plug gapping tools can be categorized as either wire gauge or leaf gauge gapping tools. Either tool can be used to gap a new spark plug, but a wire gauge gapping tool is better for gapping a used spark plug. In this video I show how to use these tools and why one is better than the other.

Thank you for watching!

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24 thoughts on “Small Engine Repair: How to Gap a Spark Plug

  1. Hey I appreciate the detailed video and illustration.. I have a much better understanding now.  Now I will go and install my new spark plugs today!  =) Thanks!

  2. Great vid, thanks!  On another note, my mower has been hard starting and when I checked the plug it had a kind of gummy oily substance on it.  Any advice would be gratefully appreciated.

  3. Thank you so much for this detailed yet simple video. I am getting close to 60 years old and have always had a husband or paid someone to do maintenance on my lawn mower. However, I am now attempting to do as much as possible on my own. I have an older lawn mower, so if I kill it, not such a great loss! I have my eye on one I really want but can't justify buying a new one so long as the old one works. So far, I have managed to successfully change the oil, change/keep the air filter clean, change the blade, and clean under the deck, and it is still usable, LOL! I am now going to try changing the spark plug, and this video is just what I needed!

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