I owned Syssa s/n 261 that I received on 11-19-09 after a 3 month waiting / promise period. There were some issues with these early engines including the carb, prop drive hubs shearing the key and mufflers coming loose. Most of these issues were resolved on later engines but by that time it seemed that Todd Syssa was wanting to get away from the engine business and the whole project (along with Todd) just sort of faded away. Sad as with a few improvements, it could have been a great little engine. I replaced mine with an early rear intake DLE30 that still serves me well to this day and it has a lot of flight time.