Thanks Dave for the quick response! The valves have been adjusted, 2 brand new cans of fuel with different batch numbers, 2 new glow plugs and no fueling valves (just the recommended setup described in the manual). No leaks in the lines or tank, check valve works.

Could I ask you this, would tank pressure problems cause this, ie no smoke in the exhaust, and low power? Needle was gradually opened as I mentioned, I just checked how far, would you believe 4 turns out on the high needle? On take off, there is plenty of smoke, then nothing. I have a Tetra tank which I want to replace the stock tank out. I'll do this right now if that makes sense to you.