Twin Cam Motors Twin Cam 1998 thru 2017

How do my spark plugs look?

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Old 03-20-2021, 10:19 PM
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Default How do my spark plugs look?

My 2011 deluxe 96b is getting poor MPG.

just swapped my plugs , do they look Normal?




 
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Old 03-20-2021, 10:45 PM
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Originally Posted by GreenMonster
My 2011 deluxe 96b is getting poor MPG.

just swapped my plugs , do they look Normal?



I'm worse than you about these things so I use this.


 
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Old 03-20-2021, 11:08 PM
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Twin cam Fi bike. Looks normal, and mixture looks good. Possible poor gas (winter blend)
 
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Old 03-20-2021, 11:12 PM
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Thanks yes our winter blend sucks here in SoCal .
 
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Old 03-21-2021, 09:21 AM
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Those plugs look a bit too white to me. Shiny white plugs indicate they’re running too hot, usually from a too lean condition. How long were they in the motor? Are they the correct heat range plug? Plugs should be beige, not white. However I doubt any of this is causing really poor mileage.
 
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Old 03-21-2021, 09:24 AM
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Look fine to me. Might be burning a little bit of oil past the rings or intake guides which cause the buildup on the strap but nothing to worry about.

Add:
Could also be oil from breather if run to the AC.

IMO nothing wrong with so cal gas as long as they keep the ethanol low.
 

Last edited by Max Headflow; 03-21-2021 at 09:28 AM.
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Old 03-21-2021, 09:55 AM
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Originally Posted by bad tappets
Those plugs look a bit too white to me. Shiny white plugs indicate they’re running too hot, usually from a too lean condition. How long were they in the motor? Are they the correct heat range plug? Plugs should be beige, not white. However I doubt any of this is causing really poor mileage.
not sure how long they were in there, bought it used recently maybe 2 months,
 
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Old 03-21-2021, 10:44 AM
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Define poor mileage. Plugs look good.
 
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Old 03-21-2021, 11:38 AM
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Originally Posted by chopper_man
Define poor mileage. Plugs look good.
25mpg mostty city
 
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Old 03-21-2021, 07:26 PM
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I don't think that's bad around town, you're never getting time in the higher gears to average it out. Get some wind time on it and see what she does.
 


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