Yea mine are due to be changed after I got the heatsheild in place.
The spark plugs should give you a good indication of engine condition and how well or not its been firing on each of the cylinders.
While I'm looking at the top of mine I noticed there is a slight mess at top front could be just what someone did not clean off afterwards as I don't notice any drips or leaks.
I Wil be sure to clean this off as I want a clean and tidy engine bay.
For future work and viewing alike.
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