http://youtu.be/Bij9RLnQq9Q
The 400 has been rebuilt and tested and some problems were found. I decided a complete strip and reassembly was the best idea. A thorough check and test of every step lead to the conclusion that the engine itself is fine. No air at all. The carbs however were a different story. I did a LOT of research into the carbs and discovered that there isn't a lot of places to find the information required to check everything. When I did find the info it pointed to the reasons for it ...