Take off the rotor start and clean the 1 way bearing and re-lube with sewing machine oil.
For general engine maintenance, Pg 17 - 21 of the manual, run through those sections.
Re-set needles to stock settings and re-tune with new fuel and glow plug.
Whats wrong with the engine? Won't run or runs but like crap?
If you havent run it for that long, it may have lost compression if you run it too lean for too long, or the glow plug is stuffed.
Did you run it in along the lines of Gunner's break in procedure?
Rear port .21 will do it.