Re: HP Speed carby
I didn't do the measurements, but that looks like the exact same carb that I now run. It does much better than the high dollar CNS V3 that originally came on the motor. I also like the fuel shut-off on the carb as extra security while it's sitting in my garage.
Sorry, but I've never run a plain NT carb.
Good luck with whatever you decide!
You're never lost until you run outa gas.