I might add that if the motorcycle is fuel injected and cold, pushing and holding the "bi-starter" lever in the applied position when starting will help to get the engine running.
If the engine has a old fashioned carburetor then, like all carburetored engines, the rider needs to learn what the machine likes and then use that method every time.
For instance, with a cold engine, my old Ducati single insisted on having its carb "tickled" for more than 1/2 second but never longer than 1 1/2 seconds before kick starting it. If I followed this routine it would start on the first kick. If I didn't, it would start one kick before my leg fell off.