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Spark Plug Difference

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Spark Plug Difference

Postby dennis » Fri Apr 27, 2018 6:31 pm

Have a B&S Model 128T02, Type 1270-B1, Code 10080462 on a Craftsman mower (917.370680). It calls for a Champion RJ19HX spark plug (0.030"). Never heard of it. Anyone know the difference between it and an RJ19LM?
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Re: Spark Plug Difference

Postby RoyM » Fri Apr 27, 2018 7:31 pm

Apparently the HX has a finer ground electrode for supposed easier starting in some applications. IMHO don't worry about it, the LM will work just fine.
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Re: Spark Plug Difference

Postby KE4AVB » Sat Apr 28, 2018 8:15 am

Sharp pointed spark gaps and those sharp corners will always arc better. This is why new preform better than used plugs as the electrodes are worn rounded on used plugs.

Could use 5846 or 5843 to replace with the 5846 being the hotter plug. Note will have a 3/4" Hex vs the 13/16" of the RJ19LM.
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Re: Spark Plug Difference

Postby dennis » Fri May 04, 2018 12:58 pm

Thanks for the information, guys.
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Re: Spark Plug Difference

Postby creia » Fri May 04, 2018 3:59 pm

Personally, I would not use a Champion plug. Go to a cross reference chart and get the NGK equivalent. While "back in the day" Champion may have been the standard plug to use, I am now doubting that they are made to the high quality specs they used to be. About 5 years ago I starting getting "duds"- these were brand new, right out of the box plugs. After I switched to NGK not one single dud. Also, I started to look at what plugs professional small engine parts and repair shops were using in my area- every one was using NGK. That tells me something right there.
Just my .02 cents...
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Re: Spark Plug Difference

Postby KE4AVB » Fri May 04, 2018 7:51 pm

NGK might fine in the larger plugs but the CMR6H and CMR7H are causing all kinds of problems for me. I even had one to cause dieseling in a Stihl hedger earlier this year. I done gone thru 10 so this year.
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