Well found the bloody problem, started first pull ran great after a minute or two did it's usual bog down, too lean then stall. Now i probably should have mentioned it was ok on a full tank but even at 3/4 tank it would begin to happen. Anyways i was watching the primer bulb, it would slowly fill up with bubbles then engine would stall. watching the lines as i pushed the primer it hit me, the bloody fuel is being sucked up the return line and pushing out the supply. the fuel tank and with lines were replaced under warranty because the tank leaked but im positive the lines were this way before, and the other one i have is setup exactly the same! Swapped the lines over, slight retune ran flawlessly for 10mins on 1/4 tank.
