Free US Shipping on all orders over $50

E3.10 Spark Plug

SKU # e3.10
$ 6.49

E3.10 Small engine plug that fits a wide variety of 2-cycle and 4-cycle engines. Most often used in a wide assortment of Lawn & Garden equipment, especially lawnmowers.


You are $50.00 away from free US shipping!


E3.10 is a 14mm, 0.375” reach plug with a gasket seat. It is used in multiple small engine applications, especially lawn & garden. The ground electrode is designed with E3’s patented DiamondFIRE technology which is proven to improve power, increase fuel efficiency, and dramatically lower hydrocarbon emissions in long-term use. The unique ground electrode and full-size center electrode also provides optimal performance over an extended product life.


  • CHAMPION: J17LM, J19LM, J8C, RJ17LM, RJ19LM, RJ8C, 5861
  • NGK: B2LM, B4LM, B6S, BR2LM, BR4LM




Part Number: E3.10

Resistor: Non-Resistor

Hex Size: 13/16"

Thread Reach: 0.375"

Thread Diameter: 14mm

Seat: Gasket

Tip/Gap: DiamondFIRE Adjustable Gap


Write a review

Reviewed by Pete Layher
03/16/2018 9:18 pm
Great economy from a great plug!
I use E3 plugs in all my small engine and lawn equipment. Everything from 2 cylinder lawn tractor to chain saws. I always knew I was getting better economy but my snow blower is where I was able to really see it. I was able to blow my drive 1 1/2 times on a tank of fuel running the 10 horsepower engine full throttle. After installing your E3.10 plug I can blow at least 2 and quite often 3 times on a tank and the plug is 5 years old. I have seen similar improvement with my in laws 2 stroke Toro snow blower. I only wish your plugs were available when I was racing my 400 dirt bike I’m sure it would have given me an edge.

storyboard E3-10 image

storyboard E3-10 image