You can order a front sprocket 13 16 or 18 @ importers its fits the lectrika motor.
https://www.govecsgroup.com/importeure/
if you use the lectrika motor and size 2 sevon did you also replace the .dld file ??
Govecs has developed a duo belt drive for 45 speed and higher they call it "dirth"...
change the front sprocket 13 teeth to a 16 teeth
and with the dvt software reduce the number of max rpm and change the speed radtio odo and trip.
this help enormously in rocking on topspeed
the new Govecs 1.5 2.5 2.6 already have a 16 tands sprocket
Cnutsol