Beach Cruiser Bike

my nephew picked u[p and build a Beach Cruiser Bike from canadian tire for his wife , problem is there is only 1 gear and you pedal backwards to brake , the break isnt a problen , but being a bit hard to pedal and get up speed to pop the clutch on the Beach Cruiser Bike is , is there way to change the front sprocket to a smaller one so its easy to pedal and get it going ?

this bike is only used with the 80cc engine so it would be great , the hub on this bike is larger then most regular moutian bikes so regular pedal and hubs wont fit it as far as i know.

this is the bike here , i know pedaling isnt super hard but ona hill or from a dead stop on trail it is for his wife.

Supercycle Classic Cruiser 26-in Comfort Bike, Men's | Canadian Tire

ok thanks , i asked at one bike shop and they said there usually there different but maybe i was talkin to the janitor then . hehe hope i can locate somthing.

ps: we don't need the derailer to work , as we plan on leaving it single speed and just moving the chain to the smaler gear and shortening the chan so its snug and stays on the same way it is on the larger gear from factory.