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Spark plug reading

Old 09-11-2013, 07:58 PM
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Spark plug reading

to lean? Same plug, front cylinder, differant angles.

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Old 09-11-2013, 11:04 PM
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Looks okay to me...

NGK Spark Plugs USA
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Old 09-12-2013, 05:41 AM
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Originally Posted by Fistfullofthrotl718 View Post
to lean? Same plug, front cylinder, differant angles.




Cant get much better than that.
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Old 09-12-2013, 05:48 AM
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Spark Plug reading is very pre 1980.

The practice involving brand new never run plugs, a full throttle run with ignition & throttle chop at speed... then pulling the plugs to observe them worked very well before all the different gas additives and mixes or season gas came into play.

If you're hell bent on doing a plug "reading" ... get yourself some clean, fresh race gas.. two new plugs and a dyno or open road and a trailer to take the bike home.

That said...... "reading" plugs still has some limited usefulness.

The plug above shows no severe internal engine damage (no physical damage on the plug no sign of metal deposits), no serious oil getting past valve seals or rings, no signs of severe pre ignition....
So there is that

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Old 09-12-2013, 07:27 AM
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Reverting to my pre-80 plug reading days I would say your a tad rich, but Marquez is right fresh plugs and good gas and a clean throttle chop and you'll have better results.
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Old 09-12-2013, 07:38 AM
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Plug reading is more of a two stroke thing than four stroke. It used to be much more important than it is now (I used to do it all the time on my RD's) But I'd have to agree, that plug looks like its been burning puuurrr fectly
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