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NGK CRM6H high failure rate

AVB

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Just wondering if the Bosch USR7AC is any better than the NGK CRMH spark plug? I have seen a high failure with the NGK liitle 10mm plugs.
 

Fish

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I would just go with Champions. Everyone loves to bad mouth them, because someone told them how bad they are. I have had more plug problems out of the Jap/German chit, when Champions were the most used brand. But listen to a lot of blather about how {pet brand} is the best, etc. Champions in my experience are more trustworthy....
 

Fish

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We will hear the "bucket of dirt" post here soon......
 

Fish

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Kind of like "Penzoil"......
 

AVB

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Well most time most are good. It just I am having a lot failure with the CMR6Hs. I have deconstructed the last one to failure and found that for some the insulator is becoming conductive; shorting out the plug. With an ohm with the leads on the plug I get infinity impedance until I press harder on the insulator before the tip then I get 800K ohms. I just got to figure out if it is bad construction or a fuel related problem. It not the carbon build up as I clean that away before testing. This last plug failed within two weeks of use by the customer in a Stihl HS56.
 
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