carb swap

there is no stock jet size for the RT carburetor it depends on your elevation humidity atmospheric pressure are change engine setup timing ratio your way inclined downhill octane level . if you're not high altitude jet down, are you running a reed valve kit if you are you'll just up .it all just depends on what you're doing and where you're at .Good luck you'll figure it out .

if the jet is working well in the NT, I'd first try just swapping it into the RT