Rust on sparkplug
 

Hi everyone, changed my spark plugs this morning and found that the old ones have rust on all 4 of them. Do I need to worry?
bought the car this August of 2021 at 42k kilometer odometer. My tuner said it might be the quality of gas that was used by the previous owner. Can that might be the cause of this?

Thanks! :)

Ceramic certainly doesn't rust.
I'd think the more likely suspect would be some sort of fuel contaminant.
Wherever the previous owner bought gas, get it somewhere else.
The twins have a plastic gas tank, so it's not coming from there.

That is not rust. I would guess that is deposits from the fuel. If everything is running good I would not worry about it.

Thank you for your input guys. I really appreciate it. We suspect that it might be the previous tune of the previous owner running to rich.

Looks like sulfur deposits to me.

Bubba says those deposits are due to burning "sour" gas. I tried to explain to him that the gas is not "sour", that the crude oil that the gas was refined from was "sour" (high sulfur content).

:iono:

looks like it's pretty close to 'best' to me.

https://motoredbikes.com/attachments...rt-jpg.100805/