I have an early 90s German mini with a 1275cc and single carb. I have a hard time cold starting it. I am pulling the choke out all the way to start. Yesterday was the first time I started it for a week and a half and it started up fine no problems. Now it won't start and I can smell the fuel so I know fuel is not a problem. Most of the time it takes a few tries to start and a the rest of the time it will start right up. On the bad days it will start and then die right away, then it will take a few tries to start. Any Idea?