Clean but don't looked steam cleaned.
I've found a small hole the size of a 5p in the top of the exhaust back box, would this be enough to give high emissions readings.
on cylinder 4 the spark plug thread and tip was oily
I did a sniff test on the expansion bottle, the test liquid stayed blue so the head gasket is ok, i'm still waiting for my new compression tester to arrive to test cylinder 4.
Would you renew the stem valve oil seals to see if it makes a difference.
i get a burst of smoke when it's first started up
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