All my dirt bikes are kick (6)-Yammie TT500 and Husqvarna 410 were the worst. I became proficient with the single lung four stroke drill. Compression release in, wide open throttle, kill switch on, kick it through 6-10 times (Do ya feel lucky, punk?). Close throttle, ignition on, kick firmly. Usually worked...
On the street, My Velocette requires choke on (or a tickle of the previous Amal), Decompression lever in, ignition off, two kicks, ease kicker down 1/2 stroke past compression, ignition on, kick and Voila! With a modern carb and electronic ignition almost always first kick. Starts well when warm too.
My Triumph 750 gets the carbs tickled and 1 to 3 kicks cold and usually 1 kick warm.

My Maico 400 is the hardest bike I have to start. I installed a primer because the original Bing had a tickler. Big bore two strokes like a bit of raw fuel to start. Compression release in, kick and kick and kick. When you're wiped out from kicking get someone to push start you.