That, my friend, is GOOD NEWS! Keeping up with another with a 33% larger engine?!?!
As to rejetting, I think I would try using a restrictor plate. Where the carb mounts to the intake, simply cut a sheet of aluminum flashing that will reduce the size of the port by 25%.
I would try that first. This will have the additional effect of further increasing the vacuum available at the valve.
Have FUN on that SkeeDoo, amigo!