This post started in 2008 if you seach tt 07 diesel on the site you can pull it up, it suffers from low power as glow and Davis pulled it from production ( the head) since not that great as diesel, having a little time decided just to try it again it will still fly a small electric conversion, got it to fire off a prime but would not stay running
turns out the O ring missing from needle hence sucking "wind" not fuel you cannot get just the o ring comes with the needle, so just gambled about $7 dollars for the needle assembly, from tower really too bad TT has not addressed the issue neat little engine well made , angle needle valve martin