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Champion (5843) CJ8 'EZ Start' Small Engine Spark Plug, Pack of 1

3.8 out of 5 stars 13 customer reviews

Price: $6.10 & FREE Shipping on orders over $49. Details
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  • Utilizes EZ Start technology
  • EZ Start booster gap delivers max voltage at gap where its needed most
  • Patented rib core nose design optimizes spark energy and runs cleaner
  • Fine wire center and ground electrodes concentrate spark energy for easier starting
36 new from $2.75

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$6.10 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com.

Frequently Bought Together

  • Champion (5843) CJ8 'EZ Start' Small Engine Spark Plug, Pack of 1
  • +
  • Briggs & Stratton 30W Engine Oil - 48 Oz. 100028
Total price: $14.07
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Product Information

Technical Details

Brand Champion
Item Weight 5.3 ounces
Product Dimensions 6 x 3 x 1 inches
Item model number 5843
Manufacturer Part Number 5843
OEM Part Number 5843

Additional Information

ASIN B000WBR15E
Customer Reviews
3.8 out of 5 stars 13 customer reviews

3.8 out of 5 stars
Best Sellers Rank #11,379 in Automotive (See top 100)
#735 in Patio, Lawn & Garden > Mowers & Outdoor Power Tools > Replacement Parts & Accessories > Lawn Mower Parts & Accessories > Lawn Mower Replacement Parts
Shipping Weight 1.6 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available December 2, 2005

Warranty & Support

Warranty, Parts:Parts

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Product Description

Champion EZ Start spark plugs deliver faster starting and peak performance for small engines.

From the Manufacturer


Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Don't buy this plug, buy OEM.
I purchased two of these from Walmart thinking there was a problem with the 1st plug, what a waste of money. I bought these to go in my Husq 128ld weed trimmer, the OEM was a RCJ8Y from the factory. The RC plug was hard to come by where I live so I went to Champions site and they said the 5843 EZ start could be used also. Thinking that it was a 1 tug plug I thought I was getting one up over the stock Champion, I was wrong. The EZ start comes pregapped at .30 and the manufacturer of my trimmer Husq called for .24 I fixed the gap and it cranked up around the 3 pull but ran rough/ vibrated like crazy and would just completely shut off if you held it at low constant power. I purchased a stock plug from Oreilly that came pregapped at .24 and the thing runs better then new.
The moral of the story here is, buy what the factory used it in it, there's a reason why they use that particular plug and not a "one tug plug"
Just saying
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Verified Purchase
closest you can get to a platinum or iridium plug which I use in my cars and harleys (not available in this size). Easier starting and can operate yard equipment (ie leaf blower) at lower rpms as a result of it's efficiency.
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This plug replaced a standard RCJ8 Champion plug in an old Craftsman dirt tiller. With the regular plug, it would take me 15-20 minutes to get the tiller started - had to play with choke/throttle and keep pulling...a pretty good workout. With this plug the tiller starts in two pulls every time.

Knocking this down 1-star for a couple of reasons:
Price, for a small engine power equipment, this is an expensive plug.
Brand, Champion quality has gone down in the past few years. One shouldn't have to buy the premium plug simply because their standard plug hardly works at all.
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Verified Purchase
great price, fast ship, best quality CJ8 spark plug around, I use it for an older leave blower, the original plug is over 8 years old and still going strong, figured a spare would be good, just incase
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All I can say is that after replacing a Champion RCJ6Y plug in my Poulan pole saw with one of these 5843 plugs, it has made all the difference in the world in starting that little motor. I would have never believed that a spark plug upgrade could make that much difference, but on this saw, it has totally sold me.
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I love this plug for my mower and trimmer. It truly is a "one tug plug". It has never failed me or been difficult to start.
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Verified Purchase
Wrong plug from the specifications listed. This one was too long by 1/4 inch, and risked piston to plug strikes.
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