What is the difference between rj19lm and rj19hx

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This is the main section for any technical help posts and related questions. Never heard of it. Anyone know the difference between it and an RJ19LM? This is why new preform better than used plugs as the electrodes are worn rounded on used plugs. Could use or to replace with the being the hotter plug. What does a champion rc12yc spark plug fit?

What spark plug do I need for my lawn mower? How often do you change spark plugs in lawn mower? What happens if you use the wrong spark plug in a lawn mower? How do I know if my lawn mower spark plug is bad? Can you clean spark plugs with wd40? Can spark plugs cause a lawnmower not start? Why does my lawn mower not start? Why does my mower only run when I push the primer? How do you clean a lawn mower carburetor without removing it? Can you clean a carburetor without taking it apart?

Can I clean a carburetor with wd40? Where do you spray carb cleaner on a lawn mower? How do I know if my lawn mower carburetor is bad? What are the symptoms of a dirty carburetor?