According to Manuel the Mexican Mechanic the two needles are set to 3 turns out each so give them another turn and try again.
Also try starting with the trigger pulled in and the idle wound up full
Adjust the high speed jet first, lean ( in ) till it starts to faulter then rich ( out) till it starts to faulter then slightly to the rich side of 1/2 way between them.
Make sure there is a foot of line hanging out of the head to put a bit of load on the engine.
now let your finger off the throttle slowly.
You should be able to get it to stay running as with the idle ( throttle stop ) screwed all the way in it should be running on both the high & low speed jets.
Start backing the throttle stop ( TS) out till the engine slows then adjust the Low jet to the fastest running position then back off the TS some more.
Continue till the head just stops spinning then do the same adjustment with the low jet as done with the high.
If the head starts to spin, back off the TS a little more.
When the Idle Jet is correct you will get a smooth acceleration.
If it speeds up a bit then drops back as you throttle on the Low is a little too lean.
If it bogs down as you throttle on the Low is a little too rich.
Thanks! I'll try this tomorrow. Today actually. Reading a book.