What do these spark plugs say how my bike is running? - Suzuki GSX-R Motorcycle Forums Gixxer.com

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post #1 of 4 (permalink) Old 04-06-2019, 07:48 PM Thread Starter
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These are all standard plugs. Bikes been running weird lately. Bad gas mileage(like the gas light comes on at 85miles), strong smell of unburnt gas even after the bikes warm, black smoke when revving to high rpms.
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post #2 of 4 (permalink) Old 04-06-2019, 08:01 PM
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Re: What do these spark plugs say how my bike is running?

3 on the right look perfect,one on the left looks fouled. Could be any of several reasons
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post #3 of 4 (permalink) Old 04-06-2019, 08:22 PM
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Re: What do these spark plugs say how my bike is running?

The one on the left is an unclean burn. Probably too much fuel, not enough air, intermittent spark, or weak spark.

If you change them out and the bike goes back to normal, that's great. If it still runs poopy, explain how it runs poopy.
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post #4 of 4 (permalink) Old 04-07-2019, 08:08 AM
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Re: What do these spark plugs say how my bike is running?

Cheap way to test this, move that plug to a different cylinder, You could move the coil as well but you wont know if its the coil or plug causing the issue then go ride the bike thru a good heat cycle.
If the fouled plug follows the move to the other cylinder you have your answer, has to be the plug or coil. If not then you may have a leaking injector ( primary or secondary ) worst case is weak compression on that cylinder.
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