72CC Carb issues

[ratdude747]

I have a 50CC (bore kitted to 72CC) Gy6 that has a horrible lean pop during deceleration... i found that turning out the idle mix screw on the carb (new, Jetted to 80, 90 ran too rich) fixed that but KILLED my idle...Which leads me to think it's a coasting enricher issue?

Also, when the choke hasn't warmed up, it's impossible to start w/o giving it some gas... as soon as the choke warms up, the engine runs GREAT. Basically, the choke is over-riching the mix at cold start. Is this normal and would a manual choke conversion fix this? I'd rather not JB weld the passages as I want it to start on cooler mornings.

Suggestions?

PS- The scooter was a freebie but needed a new carb and a motor rebuild (hence the bore kit) among other things.