Re: different chain
No, but you can use #41. In fact we recommend it. The kit supplied chains are okay but have been known to have rough spots (binding links/rollers) some are twisted and they wear fast.
#41 industrial chain is available at Grainger, Tractor Supply, even some Ace hardware stores carry it. There are many other sources but that gives you a starting place.
Good luck, have fun and ride safe.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"