Hi guys, I have been reading on here for a while as I rebuilt a MS290 I had. The original cylinder/piston was scored pretty bad. I went ahead with a 390 piston and and new cylinder. I did not use top shelf parts, but don't think that I used bottom of the barrel either. My problem is that I cannot get the saw to start. I have fuel, and spark. I thought the spark was weak so I installed a new coil. The H/L screws are turned out 1 turn each to start with. The idle screw may be not right as I have messed with it. I checked the compression thinking that maybe the cylinder did not seal to the base well. I did use Motoseal. It has 150psi with rings that really not have been seated by running. I thought this was pretty good. The flywheel is new as the old one sheared a key. I have also rebuilt the carb. I feel like it might be getting flooded, but not sure. Am I missing something? Anyone have any suggestions? I have read about impulse line issues.....thoughts? I have rebuilt several hotrod small block chevys and fords, so this type thing is not a big deal, but I am stumped. Thanks in advance.