Don't worry, mine did that too. For some more of the tanks, since the cylinder is tapered, it may do that. When it is not fully broken in the fit at TDC is extremely tight. My dad and I spent a whole day trying to get my la to start. Make sure you have the throttle at idle. I was trying to do it with 1/2-3/4 throttle, it doesn't work, take my word for it. Also, they will start harder when warm. Just keep going at it, make sure it is good and rich. Good luck

Alex