what causes this problem?????
I took just a moment to go to your public profile and I see three pics of bikes you have there and each has a china girl 2 smoker on them.
it looks as if one has standard NT carb, one has what looks to be the NT Speed carb, and the last pic shows the dellorto type RT carb.
is it the bike with RT carb that sputters and dies when you pull in clutch to slow down or stop?
I have an RT carb that does the same thing, Idle on this carb has always been off a little and engine will die about 80% of the time when clutch is pulled to coast down a hill or to stop or slow down.
Not sure if what I just described is what you have happening or if the bike inyour album with the RT carb is the one with the issue, but I figured since you didnt provide much info in you initial post Id just throw this out there.
gove some details and even pix if possible and maybe we can help you figure this problem out.