My car has 34k, found out after I changed the plugs that they had been changed at 21k. The original layer on them is black; now covered by a tan layer. The layers are much thicker than i have seen in other piston engines but the center and probe for the spark appear clean in the area where the spark passes.

Thanks.
http://s137.photobucket.com/albums/q...t=DSC02166.jpg

 

Your pictures are blurring but the plugs look typical from what I could tell given your mileage. Check out my recent thread on this subject. I changed mine at 36,502 miles and looked nearly the same. Mine had the brown coke on it but the electrode was still acceptable if not nearly ready for a change.

 

And a little friendly tip on taking close-ups on your digital camera----Use the macro mode turned on by the little tulip icon on your camera. It's a little tip I learned in a digital photography class. The close-ups shouldn't come out blurry if you do.

 

I agree they look normal. What is the gap on each?

 

It's hard to read those pics. The area of interest is the center insulator material. The "layers" that form on the end of the metal shell and outside portion of the side electrode, are of no consequence. These do tend to be thicker for the rotary, largely due to ash desposits from the oil that is consumed by the engine.

 

yeah they look about normal.....

 

agree.

 

For winter, my car was missing bad at warm idle after only 4000 miles. Spent $100 for the official hotter NGKs and after 400 miles they are looking good.
http://i137.photobucket.com/albums/q...eg/SSRs019.jpg