
I thought that the code and plug cap
“wouldn’t make much difference” but I was wrong.
However, over the long years they gradually deteriorate
and degrade slowly.
The effect is “a bit surprising” level.
To put it in modern terms,
“best bang for your buck, right?”
The change can be felt in the sound and responsiveness, I think (*´ω`*)


NGK (N.G.K.) Plug Cap [8363] LD05F
The angle is 90 degrees, same as the Zephyr OEM.
I considered other shapes too, but this is the best option (*´ω`*)
At the time it was quietly hard to find and I was troubled.


Kijima Silicon Code 1m Length Black 304-4101B
Silicon code/7φ/1M/Black and affordable
it has everything.
For a parallel 4-cylinder, buying 2 will be more than enough (*´ω`*)
When you think about it carefully, “it’s been firing continuously in a tough situation”
Areas that should be serviced as time and mileage accumulate
“an eye-opener” as they say
After 10 or 20 years, you’d want to replace them.
