I can't win with this engine. Recentley had a carb rebuild from an extremelly respected dealer. All pistons have between 110-115 compression. They had no problem starting it, and I believe them. They drove in the water!!! I just tried for an hour, couldn't get it to run. I've read the headaches with this motor when it comes to starting, what am I doing wrong? Prime it, hold choke in for 5 seconds, try it, then for 3 seconds, etc.
