thank you for your information Imrich, your advice helped a lot. In fact me and my friend are trying to get this thing right. We tried various settings right now our lower end seems to be just right. And also I have Pro2K head and tail in my heli. I am using 690 mm carbon fibre blade, even thou I am thinking of getting longer blades before going to heavy load.

Right now I am using 40:1 oil mixture ratio which was suggested in the engine manual. But I am having trouble of engine losing power, which is because of over heating. But when I try to richen up the engine the tail seems to wobble. The head speed is about 1550 at hover with 5 degree hover pitch. I am thinking of going for different oil mixture. By the way where do you get amsoil??. can you find in regular stores like walmart or something like that??. Please advise on the oil mixture. Thank you lot again.
Kumar