This from Sommer KTM on kickstarting with reduced voltage:
starting (kick) an adventure 640 (or all LC4) with dead battery (reduced voltage / V) will be very, very hard, because you need full 12V Voltage (reduced ampere is allowed - so for example a little Volume 12 V battery (with 3 or 4...A) will work for kicking.
So you need 12 Volt .
Finally it is possible, but you have to kick a lot of time and if there is enough luck, you will get Voltage for first ( Zünderregung "ignition impulse") .
Mit sportlichen Grüßen
SOMMER KTM Rainer Kroll"
'02 KTM 640 Adventure-lowered
"On the road there are no special cases."
Cormack McCarthy-The Crossing
The faster it goes the faster it breaks.
And high performance=high maintenance.