NGK 4177 spark plugs lifespan

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06-22-2018, 02:22 PM

BMX Dad

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Join Date: Mar 2008

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NGK 4177 spark plugs lifespan

How many miles before they need to be changed?

06-22-2018, 03:53 PM

Chimera96

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Posts: 1,083

Re: NGK 4177 spark plugs lifespan

I swap copper plugs out every 15k mi...YMMV

FWIW I switched to the Autolite 106's per recommendation of my tuner...

06-22-2018, 07:40 PM

Injuneer

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Location: Hell was full so they sent me to NJ

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Re: NGK 4177 spark plugs lifespan

Take few out and look them over, to see if it appears to be the correct heat range for your specific build - hot enough to avoid fouling, cold enough to avoid rapid electrode wear. If the gap is starting to open up, they need to be replaced.

There are a lot of good online guides to “reading” spark plugs.