A series 1275 starting problem

[Chris Roden]

Our 1275cc Mini will only fire when the ignition key is released from the "cranking" position i.e. Ignition on. Obviously this makes it very difficult to start as you have to guess the correct time to release the key for it to fire.

My assumption was/is that there was insufficient power to provide a good spark while the starter motor was being turned.

The ignition system is standard, distributor, non ballast resistor coil, points etc. and everything is in good condition/new and a new battery is fitted. Timing, points gap etc. are all, as near as possible, correct.

Going over the car today, I discovered that the voltage at the + terminal of the coil is only 9v with the points closed, but jumps to 12+ volts with the points open. Is this correct and if not, where is the problem likely to be?

Any suggestions gratefully accepted.