HT Lead keeps popping off

[nesty]

Hi

I am not sure if anyone else experienced this in the past with stock HT leads. I bought a new set of Lucas leads and no 2 from the left (standing at front of the car), keeps popping off the spark plug after a short while. I had a set of pro-spark ones prior and the same happened, but the pop off rate far slower (say after a couple of months).

Has anyone else had similar issues with K11 HT leads, or maybe I haven’t run them correct?

 

[1275]

Is the spark plug loose?

 

[nesty]

Is the spark plug loose?

I'll check, but don't think it is, as when push the HT lead back on car runs fine.