Spark plug reading

Train_driver87
Edited Date/Time 5/21/2022 4:54am
Hello can someone help me read my plug?

Yz250 2021 running 91 fuel (0%ethanol) and 3% Maxima Super M, BR8ES sparkplug

There is a little white ring around the electrode I havnt seen before.



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Mr. Robinson 5/19/2022 2:11pm
5/19/2022 2:11pm
That's normal. Timing ring. Very thin, < .5mm is good.
Factor E
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Factor E 5/19/2022 4:44pm
5/19/2022 4:44pm
How many hrs on it?
b8res
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b8res 5/20/2022 12:06pm
5/20/2022 12:06pm
Mr. Robinson wrote:
That's normal. Timing ring. Very thin, < .5mm is good.
Care to provide details on your remarks?

Thanks

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Mr. Robinson 5/20/2022 2:28pm
5/20/2022 2:28pm Edited Date/Time 5/21/2022 4:54am
b8res wrote:
Care to provide details on your remarks?

Thanks
The little white band around the electrode give indication of how your timing is set. A slight, <0.5mm band is good. Over means you have too much advance. Has a lot to do with the fuel you're running. No band you can probably add some advance, but first you got to get the jetting right and some race fuels don't seem to show as well. YZ's tend to be pretty close to the timing and compression limit for pump gas, so you normally see a slight ring with decent jetting. His overall jetting is pretty good, so he's getting a ring. If your jetting is way off, or your timing is way retarded then you won't see a ring.
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b8res
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b8res 5/20/2022 9:43pm
5/20/2022 9:43pm
b8res wrote:
Care to provide details on your remarks?

Thanks
Mr. Robinson wrote:
The little white band around the electrode give indication of how your timing is set. A slight, <0.5mm band is good. Over means you have too...
The little white band around the electrode give indication of how your timing is set. A slight, <0.5mm band is good. Over means you have too much advance. Has a lot to do with the fuel you're running. No band you can probably add some advance, but first you got to get the jetting right and some race fuels don't seem to show as well. YZ's tend to be pretty close to the timing and compression limit for pump gas, so you normally see a slight ring with decent jetting. His overall jetting is pretty good, so he's getting a ring. If your jetting is way off, or your timing is way retarded then you won't see a ring.
Thanks for the explanation.

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