Im somewhat new to the moped world, and I have gotten a 1978 Puch MKII. After getting a new carb (15mm Bing) it had finally started and ran. My only problem is that it will not just sit and idle. When started it will run all the way up to 25 mph if I do not hold the brakes. It is a 2 speed and I have a proma exaust on it. I was wondering if there is anything I can do to get a better idle, because my friend has a 1980 Puch Maxi-Luxe, single speed, and it idles fine. And I have messed with the throttle cable adjustment and the needle height in my carb, it is now in its lowest notch, or whichever makes it more calm. Thanks alot to those who can help.