I'm almost sure nightcruiser has a valid point that the idle circuit jet and it's adjustment can have a big effect on everything in the lower range. still battling with the probs my cns has. I'm at an .0305" main jet now with the needle set all the way down for lean. It's too rich.
...But it's very reliable, and I'm reluctant to improve it from this point!
It takes abt 6-800ft to get it warmed up enough to quit pedalling, but that's ok! My enrichen circuit now has the cable removed to eliminate that potential problem.
I should switch the carb out, but I'm too stubborn... and having fun playing with this little puzzle. lol
Good luck
rc
In the cold when I am running that first 6-800ft I also have to pedal cause she runs rough, but if I pull the choke to open the enrichment circuit she smooths up enough to ride. I find myself using the enrichment circuit for that first stretch, after a very short run it is no longer needed. I haven't had any problems with the enrichment circuit, and find it useful for the above scenario, so I wouldn't recommend disabling it, I see no reason for that.....
The CNS carb is a different beast than the NT or "Speed" carb, they only have one jet while the CNS has three.... The PILOT JET is VERY IMPORTANT for the low speed range, if it is not letting enough gas through slow riding will be really rough, and you will probably have a hard time getting idle (idle screw all the way in??? not mine!).
I recently repaired an '87 Honda Elite 50 scooter that had been sitting more than 10 years. Quite a machine really, purrs like a kitten after sitting all those years. Anyways... While cleaning the carb I came across a strange electrical device they called an "Auto BiStarter". This is basically an electric plunger that opens up an enrichment circuit very similar to what is on the CNS carb, main difference is the Honda cirucit is automatic and the CNS circuit is manual. So the idea of having an enrichment circuit instead of an air choke is not really strange or new.....