plug color
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Cruiser
Joined: Mar 2008
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plug color
07 road king, put a new set of spark plugs in got about 300 miles on them and they still look new, just a little carbon showing by the threads, porcelain still white. wondering how log it takes to see any color...for that rich/lean reading...
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Cruiser
Joined: Mar 2008
Posts: 161
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supertrapp exhaust SE air PCIII....leaning a canned map for 20 discs to my 16 discs...runs great but the 20 disc map was bad on gas mileage,after tweaking map im getting about 38mpg and no color on new plugs...
Tourer
Joined: Jun 2010
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Reading plugs (or doing a plug chop as it is properly called) is not the result of "running" the plugs normally for a while, but is instead taking a new set of plugs, installing them, then running hard through the gears at WOT, and while still under load pulling the clutch and shutting the ignition down at the same time, pull the plugs and 'then' reading them.
Anything else it arbitrary and will not provide the proper readings for jetting/tuning.
Anything else it arbitrary and will not provide the proper readings for jetting/tuning.
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,208
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From: Central Illinois, Between I-80 and I-74
Reading plugs (or doing a plug chop as it is properly called) is not the result of "running" the plugs normally for a while, but is instead taking a new set of plugs, installing them, then running hard through the gears at WOT, and while still under load pulling the clutch and shutting the ignition down at the same time, pull the plugs and 'then' reading them.
Anything else it arbitrary and will not provide the proper readings for jetting/tuning.
Anything else it arbitrary and will not provide the proper readings for jetting/tuning.
What you should be mainly concerned about is running too lean or too rich under normal operation.
Tourer
Joined: Jun 2010
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Yup ... there are certainly different ways to the chop.
And lots of information on how to do it, can be found on the 'net.
Most important is to not be jockying the throttle about during the chop run.
That and the fact that when at WOT you are looking at the main (not the needle taper) is why I say WOT.
One the main is right unless you have some sort of crazy taper, you will be safe.
Most of us are just looking for the right size mains/ensure we arn't too lean and damaging our engines.
But .... you will need to find some decent fuel (racing) to get a good reading, as (IMO) most pump unleaded won't really provide a good reading.
And lots of information on how to do it, can be found on the 'net.
Most important is to not be jockying the throttle about during the chop run.
That and the fact that when at WOT you are looking at the main (not the needle taper) is why I say WOT.
One the main is right unless you have some sort of crazy taper, you will be safe.
Most of us are just looking for the right size mains/ensure we arn't too lean and damaging our engines.
But .... you will need to find some decent fuel (racing) to get a good reading, as (IMO) most pump unleaded won't really provide a good reading.
Last edited by flyer91; Jul 6, 2010 at 11:55 AM.
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