A useful remedy (unless there is a mechanical problem with the left magneto of course) is to deliberately over-prime and use the flooded start technique.
I have done this in OAT down to 0°C or so in Lycomings with three out of four cylinders connected to the primer. Works with a weak battery too - engine should start on first or second revolution.
Secondly, try waiting up to a full minute after priming before turning the engine. I think (not certain) that this helps because it gives cold fuel time to vaporise in the cylinder, helping combustion with a weak spark.
cheers,
O8
[ 09 January 2002: Message edited by: Oktas8 ]</p>