It is an Outrunner Brushless I believe. Try something like this:
http://www.e-fliterc.com/Products/De...rodID=EFLM1505
It may not necessarily be the KV rating but the Brand name of the motor. Also, the KV is not the really important part when picking a motor, it is the amps, which then leads to watts. Watts = volts x amps. For example: if you have an 11.1 volt 3 cell LiPo battery and a motor (using the one above) that has 22 amps continuous, you wind up with 245 total watts of continuous power. For your plane, which I believe is around 22 ounces or 1.38 lbs, you would need around 175 watts per pound (150 min.) for unlimited 3D performance. So, 1.38 lbs x 175 watts per pound = 242 total watts of power required. Hopefully that makes sense. Also, what battery are you using, the one it came with? That could be something to look at too. Something like a Thunder Power 3 cell LiPo 2100mah Pro Lite series. Capable of delivering much more of a punch.