Just an update after approx 7500 km on ER10S spark plugs ...the gap increased from 0.024” to 0.0375” which is quite a lot for short period of time ...I guess I have to gap it no more than 10K interval
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The new Brisk er12s plugs have been installed. Like others have mentioned, my idle is now smoother. I don't know why colder plugs would do this, but these did.
Here are the NGK plugs that came from the factory. Plugs 1-4 in order from left to right. They actually look pretty good, other than plug 4.
Here is the plug from cylinder 4. Note the oil on my hand and threads
Here is a picture looking through the valve cover and head down to the piston. Note the oil. Sorry part of picture is out of focus. It also looked like there may have been a bit of oil on top of piston.
And how do you gather this info? They transfer heat just fine and I'm 150hp over stock with my IS38.
The new Brisk er12s plugs have been installed. Like others have mentioned, my idle is now smoother. I don't know why colder plugs would do this, but these did.
Here are the NGK plugs that came from the factory. Plugs 1-4 in order from left to right. They actually look pretty good, other than plug 4.
Here is the plug from cylinder 4. Note the oil on my hand and threads
Here is a picture looking through the valve cover and head down to the piston. Note the oil. Sorry part of picture is out of focus. It also looked like there may have been a bit of oil on top of piston.
Wow! So far after my 40 mile commute home you can tell some small differences. In the photos are the what I believe are stock spark plugs from almost 50k miles.
How do the factory plugs look with that amount of mileage on them?
Mine usually go fro. .020 to .024/5 in 5k milesJust installed 6th set of er12s with 10k mile intervals. Gap increased to .036 from .026. Was running perfectly fine even at that gap but it was time to swap.