I have had the same problem with my 170DZ. After discution on the French F3A forum papaone and Mr Carrier could help me. Thanks to them.
The solution is quite simple.
* Open your high end at 2.5turn.
* Close 2 turn clockwise the reg (from the factory setting) (I have take the motor out of the box and give two turn clockwise)
After it start your engine. If he don't work close more the reg. After it you can adjust with the high end.
I hope it could help you?
regards.
Fifou