After the rebuild of a MINI engine I fitted the distribur (I hope it‘s right) in a wrong way, or better the driver for it. So the spark fires,
but it fires in lower deadend, not the topend point. It took a long time to find the mistake.
Another time we changed the leads. Only changing one hole to the right. The same result- firing in the lower deadend.
Sorry about my bad English, but I hope someone understands and can translate it in the right way.
Greets René