Cold Starting TaoTao 80cc BBK Problems  By  wamgaming (Read 725 times)

Hello, I am having issues starting my moped in cold weather. The moped is a 49cc taotao with a 80cc big bore kit on it. The moped also has an upgraded exhaust, air filter, cdi, and coil. When it is warm outside, roughly 70 degrees or above, the moped starts no problem first time. However if its cold outside, the first start of the morning is rough and takes a lot of cranking and usually some throttle to get started. After its started, the idle isnt normal but I can tell the auto-choke is working as the revs slow down when warm. There are no dying problems after its starts. However when decelerating or coming to a stop I hear tiny pops out the exhaust. Sounds sort of like little tiny backfires, but not loud. It will continually pop all the way down a hill or until more throttle is given. It also seems to have a very low idle after coming down from being revved, similar to bogging.Sometimes sounding like it wants to die. However the idle speed is perfect, on the stand or after stopped for an extended period of time.

I have recently put a brand new carb/choke to make sure this wasn't the problem anyways. The carb has an main jet size   and a pilot jet size 75. I tuned by letting it warm all the way up and screwing the fuel screw to get the maximum idle speed. I also adjusted the valves to 0.004in on the intake and exhaust. 

I am totally at a loss, and am sick of messing with this thing. I really need some help because I am at a total loss from where to go from here. I was thinking it could be a spark problem, but I don't know why it would only do it when its cold. Thanks