Originally posted by NitroOB4You
Ok...I am ready to give up on this engine...D5..sorry guys 
I have shortened the pressure line and am confident all other parameters, ie plug,shim, etc are correct.Yet no matter what I do I can not get this to work.It simply will not idle.Now, with the shorter pressure line the idle jumps almost immediately, then if I try to lower the idle, it dies right away and wont start. Also, Ive noticed that it is sticking again.Im at a point now, where Ill either sell it off, or one last possible solution...Im thinking maybe another carb from another manufacturer. Anyone know if there's any different ones that will work?
This also sounds like a bad seal on the front bearing with the inconsistent problems you are having.
If the o-rings are all good, this might be the issue. Bad seals cause air to leak into the motor and makie tuning nearly impossible.
Boca sells a double seal bearing to replace it that is very reliable.
J