I know that spark plugs are very very important for starting this engine.
My sugestions :
1. Check spark plugs ( take it out from engine , connect one with cable , put side of it to metal part of engine , turn on moto and try to "kick" by hand and look at spark plug , if there is "electric shoot" in place where it have to be is good, if not buy a new 2 spark plugs.)
2.When engine is cold use choke before kick , and I sugest do not open fuel before first try . If engine start then open fuel . You can open fuel for few seconds and close it and then try to kick( remember of turn on key and start button) , and don`t open the carburator

For good next time
Before you turn off engine , close fuel and wait a moment with workink engine until it RPM start to rise , then turn off.
I have mc 18 and if I forgot about one of this steps, then begins problems
SOrry for my english. ( I hope that will help you)