I haver tried to run with muffler pressure (tank 12" behind the carb). Needle 4 1/2 turn out. OK with half and full throttle but too low pressure at idle, the Moki stops. I now feel tha I have two options;

1-block one of the pipes on the muffler,
2-move the tank forward behind the firewall and go woth the manual.

Both cases means taking out the Perry pump.

Ideas please................!