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Black Fouled Plugs

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faiz_mur:
Hi Need advice
My cb500k
All this while was running ok
No issue plugs colour was good
But recently all the 4 plugs have black dry carbon black

I did check n replace ignition coil
Spark plugs caps and plugs
Did check ohm resistance using multimeter
Bike using CDI
Did do Static Timing to F mark
Did valve clearance and cam chain adjustment

Need advice if its due to main jet can it been suddenly ?
I mean all this while was good with same jet
Carb fuel level was good too

Thanks

deltarider:
Anything under the seat that could hinder air intake? Has the engine been idling for a long time? What plugs do you run?

Johnny4428:
Choke?

Johnwebley:
Ideally you check the ignition timing with a strobe at +4.500rpm.



Sent from my SM-A750FN using Tapatalk

K2-K6:
Have you checked the air filter?

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