EVO All Evo Model Discussion

Spark plug question

  #1  
Old 03-21-2024, 10:08 PM
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Default Spark plug question



Bought the bike, replaced the plugs, ran a little over 3000 miles and reached the 15k service so I pulled them to find this. Is this normal?
Am I running rich? For sure smells like it. Where should I begin?

I replaced them today and road around for an hour. It’s always ran great and never had any major problems, just basic maintenance and slow warm up time, you’d expect from a 30 year old bike

But i would say it runs pretty hot, I’ve been reading about switching the coil/ignition module to single fire instead of dual, would that help clean these plugs up any?

Thanks for any help

 

Last edited by HeritageHippie; 03-21-2024 at 10:30 PM.
  #2  
Old 03-22-2024, 03:33 AM
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Nothing wrong with those plugs
 
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  #3  
Old 03-22-2024, 06:01 AM
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Plugs on newer bikes tend to run "white" on the ceramic, because they are engineered to run lean (thanks EPA)

On an older bike, I always looked for a tan color on the ceramic, and nothing looking terrible on the electrode......and no soot or oil.

Those plugs look fine
 
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  #4  
Old 03-22-2024, 06:08 AM
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The smell is the idle mixture adjustment its on the rich side
 
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Old 03-22-2024, 06:30 AM
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IF…( that’s an important if..) you pulled them correctly, they’re definitely reflecting a somewhat rich condition.
Easiest ( read: least costly) mod to try is another set of plugs that are a bit hotter.
Whatever you do, don’t make the mistake of lugging the bike around, through the neighborhood for example, then pulling the plugs to read them.
 
  #6  
Old 03-22-2024, 06:31 AM
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Year and model of the bike would be useful.

Carb or FI ?
 
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Old 03-22-2024, 06:50 AM
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They look fine
 
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Old 03-22-2024, 07:58 AM
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  #9  
Old 03-22-2024, 11:32 AM
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I agree with John idle looks rich on those plugs.. Everything else looks pretty good though... However I wouldn't be running champions try NGK BPR5ES... And set to .038"
 

Last edited by 98hotrodfatboy; 03-22-2024 at 11:35 AM.
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  #10  
Old 03-22-2024, 12:20 PM
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I have never had an issue with Champion plugs since I started wrenching and riding, over 50 years now.

Actually, I have never had any issue with any OEM plugs on any machine that was properly tuned.

Those plugs look fine.
 
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