I am cleaning up a 78' Sachs and just last night I got it running but once it is started it will die out after about 30 seconds of idling. If I give it some gas it will die out right away. I noticed that there is exhaust coming out where the pipe connects to the cylinder head so there might be a leak there. I am going to fix that after work today.
My other idea is that maybe my jet needle is missing from my carb. I have a Bing 85/12/104 carb and it does not have the jet needle through throttle slide like the more common 85/12/101 carbs. There is a brass "pipe" coming up into the slide chamber in the 104 that is not in the 101 so at first I just thought that 104 just must not have the jet needle. But now I am thinking that maybe my carb is missing this part. Should a Bing 85/12/104 carb have a jet needle.
I attached a picture of what I am talking about in case I am confusing terms.