I have a Poulan 25cc that I converted.  It is running on XYZ electronic ignition and with a WT 324 carb.  With an APC 16x8 I am getting 7100 rpms.  Only mods are the larger carb, gutted out muffler with two 1/2 inch holes drilled in it, and the electronic ignition.  Once I got the timing sorted out, it runs great.  I use it to fly my Dynaflite SE5a.  Flies it great.  Had a ball flying it yesterday.  </p>

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Jim</p>