Thanks guys My other engines run at about 3 turns but going through some engine manuals that I did find online it seems there are engines that suggest 1 1/2 -2 turns as a start so perhaps it is right. All the fuel lines are good, that was the first thing that I checked. I have a 10x4 prop on it which I think is about right. The idle and transition are good so maybe it's just because it's an old engine. I'm going to fly it next week and we'll see how it goes. I don't suppose anyone knows a link to any Thunder Tiger manuals? Thanks for the responses.