Welcome to the site !!
In general , its clutch drag , and you can't really adjust it out of it without it affecting how the clutch works , its fairly common to not be able to start a bike in gear , no matter the brand , especially a 4 stroke , the clutch/tranny being engaged/in gear is not allowing the engine to get enough RPM's during the kick cycle to allow it to fire , it would be equivalent to trying to start the bike with your hand , or spinning your tire by hand while on the stand , then trying to do the same thing with the tire dragging on the ground
Watch MX or SX and watch a rider after a fall or stall , and he is rocking the bike back and forth trying to get it into neutral , you will also note that the ones that do not do this are sitting there kicking the crap out of their bike and just watching the other riders go by , usually then a announcer will say (on T.V.) "he needs to just calm down and take the time to put it in neutral"
Even bikes with E-Starts can sometimes not start when its in gear
Neutral is your friend .....
