If you are using the Park 370 KV4100 (or similar) you will probably want a 8T pinion. Best thing to do of you don't want to pay shipping is have your LHS order it OR make it worth the shipping cost by ordering extra goodies like another battery.
ORIGINAL: lear440kts
After nearly a month of my cpp flying like crap, I finally found the problem. Had a bad servo. Wow, what a difference in flying! It's amazing, this thing flies like a dream now. I just wish I would have noticed the bad servo sooner. It looked like it was working properly, but it was not centering to the same position each time it centered. I have a new BL motor ready to install, does anyone know of a good place to buy a 9T pinion, where shipping costs are less than the cost of the pinion? (I thought the motor came with one, but once it arrived, it didn't have one)