OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Spark plug CJ8 and RJ19LM

I have 2 Quantum 35's both model #121702 yet 1 has a CJ8 plug the other has a RJ19LM.Is it ok to run the RJ19LM plug instead of the CJ8?

same plug , different sizes , fine to run both in either or machine

Hello wotwozthat

Yes, the RJ19LM is the replacement for the CJ8.
They are interchangeable.

Hope this helps.
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JACK

Yep I thought that was the case,I just needed to hear it from someone else.Thanks for the reply's vccomm and CyberJack.

If it screws in it will work, ive got a toyota camry spark plug in my ride on, cos the factory one crapped itself, no issues whatsoever

goodo , depends on heat ranges too . if you like to burn a hole in something ? then allgood , or run rough , wrong reach (at best close the gap , worst damage a piston)
never hurts to ask anyone anything

The C8J and RJ19LM are the same heat range of hot. The RJ19LM is resistor plug for RF noise suppression. In older engines that have borderline compression the C8J will give better performance as it will more spark energy at the tip. Both are 14mm with 3/8" reach.

Thanks for that info AVB about the CJ8 ,that sort of information will be helpful for future reference.