The problem:
Super tiger S3000 had the same carb as the S90K with 9mm venturi bore = good fuel draw[sm=thumbs_up.gif]. The G3250 has a gigantic 12mm bore and thats the main reason for it being more difficult. Big bore carbs. are good for very high topend but not for normal sundayflying mostly at the mid throttle.
If one makes a sleeve that reduces the bore to 10mm I am pretty sure the engine will not have any fuel draw problems and the midrange gets much better as a bonus.
Replacement carbs:
OS7D or Mag108 carbs are good for this engine. Both need an sleeve to fit in the crankcase.

It you use a tuned pipe this engines makes the same power as a modern 50cc gasoline engine and a whole lot more than most 50cc chainsaw conversions.