Question about Ngk Lfr5A 11 Spark Plug
I wish you could describe exactly what you meant by burnt. Because that could help with reading the plug and that in turn could give an indication of what is going on in the combustion chamber. If the thermal insulator at the center is completely melted for instance it could indicate that the mixture in the chamber is too lean and hence wearing the plug faster. If you have black deposits on the electrodes then the mix is too rich or there is oil leaking from either your rings or gaskets into the combustion chamber causing fouling and early destruction of the plugs, Mind you, I am assuming that your LFR 5As are the manufacturers recommended plugs otherwise their ratings could also affect what is going on in the combustion chamber and consequently the plugs. A rating of 11 for NGK is usually a cold plug and it will do well if the engine is frequently run at high speeds rather slow town start and stop idle situations.
Posted on Feb 02, 2011
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Posted on Jan 02, 2017
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