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Old September 13th, 2020, 04:50 PM   #1
Azn400
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Name: Duc
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Smoking O2 sensor

So white smoke comes out of O2 sensor after 2 minutes of idling. Bike is 2019 and has about 760 miles. What could be the issue here, team ninjette?
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Old September 13th, 2020, 06:54 PM   #2
DannoXYZ
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Hi Duc & welcome to Ninjette!

White smoke is usually coolant. Typically from cracked head or blown headgasket.

Does it come out of body of O2-sensor? Or the threads? Or out end where wires are? Any white smoke out tailpipe?

Does white smoke come out anywhere after bike’s fully warmed up (about 10-15 min)?

Last futzed with by DannoXYZ; September 13th, 2020 at 10:24 PM.
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Old September 13th, 2020, 07:49 PM   #3
Azn400
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Hello,

The smoke comes out where the crush washer meets the header. So I think its the thread. It will come out normally 1-2 minutes after starting up. The washer looks a little rusted.

Ill check the tail pipe tomorrow.
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Old September 18th, 2020, 07:47 AM   #4
DannoXYZ
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@Azn400
Any more news on this smoking?
Forgot to mention to check if O2-sensor is fully tightened. Might want to remove, replace crush-washer and re-install.
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Old September 18th, 2020, 12:44 PM   #5
Azn400
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No white smokes from tail pipe. It could be sitting for a while and burned off the old gas. After refueling with no-ethanol gas, it runs fine. I still smell some smoke but not like before. You might be right about replacing the crush-washer. Thank you.
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Old September 18th, 2020, 03:08 PM   #6
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I don't see any traces of coolant from above in your pic, but check out Cylinder coolant seal issues to make sure you don't have a leak there.
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