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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

Cooling Sys, ABS Upgrade, etc 42

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The stained black colour was from the previous misfire and can't be removed unless replacing the plug with the new one.

Quite impressed with the huge improvement of the compression data at #1cyl after properly adjusting the valve clearance.

In other words, it confirms severe negative effect when it was at zero, no clearance at all.....

All data sent to the owner and pre-caution about re-checking the valve clearance again due to massive buildup of carbon in the past but now it's burning properly.