You're right... water cleans the cylinder and the sparking plug, so the opposite!
The radiator is new (due to a failure of... the plastic elbow!).
I will carefully check (again) the whole circuit when hot... I'd prefer a leak to a cylinder head gasket!! It could also be something with the water pumps seals I changed some months ago.
Which finally, doesn't explain my brownish sparking plug... or it's about ignition, as previously suggested.
Last edited by gloupemilia; Dec 5th, 2017 at 21:07.
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