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problems starting when engine is warm



1975 kick start Harley XLCH. The bike is perfect. No problems kicking
it over. Starts relatively easily. Until, that is, when it is warm
(not warm weather but when it has been started or used).
For 5 or 6 hours after it has been started (and then shut down) I can
not get it to restart - there is no loss of compression (this is
immense) or increased compression. Occasionally it will backfire on
the 'live' kick when attempting to restart it but that is as good as it
gets.
Has anybody got any ideas as to the cause of this. Or better still any
ideas as to how this may be overcome.
On a warm engine, my compression's definitely increased
and I sometimes find my bike starts more easily with the
throttle part or all the way open.

If there's an auto-advance on the ignition, that might be
worth checking as well, to make sure it's functioning
correctly.

Things I have tried: numerous attempts at kicking. kicking with
differing numbers of primer kicks - 1, 2, 3, 4, 5. Fuel injection and
primer kicks prior to the live kick - 1, 2, 3, 4. Taking out the spark
plugs and allowing extra air to circulate in the cylinders (I think
that the bike may have started once in the past by using this awkward
method, but it is not a constant).
Things I have not tried - bump starting the bike as this would be a
useless format for restarting as any place that I would choose to stop
and turn off the engine would have to be on a hill!!
Think about this now... my bike is constantly refuelled by use of a
fuel can in my garage as I cannot use a petrol station as it will not
restart after refuelling. And in all other respects the bike is an
absolute dreampiece.