Originally Posted by
extra 300
The problem is not starting the engine, but tuning instead is almost impossible, engine is quitting above 1/2 throttle and when opening needles way off, I can reach an extremely unreliable full throttle way below the peak. I would gladly send it back to DA but they are not even replying to my emails...
Sounds like a blockage to me, check the micro filter, clean it in acetone till it is clean and you can see through it, many chuck it away. Flush all opening and orifices using a can of carby cleaner.
Fit a new diaphragm and ensure the valve needle fork arm is seated correctly.